﻿<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
  <channel>
    <title>Toán cao cấp - BF30</title>
    <link>https://hou.hcode.me/q/toan-cao-cap-bf30</link>
    <description>Toán cao cấp - BF30 - Đại học mở Hà Nội HOU</description>
    <language>vi</language>
    <item>
      <title>Câu hỏi 730658 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730658</link>
      <description><![CDATA[<p>Tính   <img src="/file/1178165/21916850-65251898.png" alt="" width="103px" height="32px"></p> <img src="/file/1178165/14349063-55558125.png" alt="" width="53px" height="18px"> <img src="/file/1178165/14349061-50912367.png" alt="" width="114px" height="22px"> 6x.cosx <img src="/file/1178165/14349060-50396172.png" alt="" width="65px" height="19px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:56 GMT</pubDate>
      <guid>8572154973282730658</guid>
    </item>
    <item>
      <title>Câu hỏi 730657 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730657</link>
      <description><![CDATA[<p>Tính   <img src="/file/1178165/21916849-43659541.png" alt="" width="91px" height="38px"></p> <img src="/file/1178165/14349059-18204173.png" alt="" width="59px" height="35px"> 6x <img src="/file/1178165/14349057-46761928.png" alt="" width="30px" height="13px"> <img src="/file/1178165/14349056-57391552.png" alt="" width="33px" height="18px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:56 GMT</pubDate>
      <guid>8572154973282730657</guid>
    </item>
    <item>
      <title>Câu hỏi 730649 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730649</link>
      <description><![CDATA[<p><img src="/file/1178165/21919176-14030717.png" alt="" width="212px" height="34px"> </p> <img src="/file/1178165/14352182-27845503.png" alt="" width="58px" height="19px"> <img src="/file/1178165/14352181-62746268.png" alt="" width="45px" height="19px"> <img src="/file/1178165/14352183-49282936.png" alt="" width="34px" height="19px"> <img src="/file/1178165/14352180-59167590.png" alt="" width="65px" height="22px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:56 GMT</pubDate>
      <guid>8572154973282730649</guid>
    </item>
    <item>
      <title>Câu hỏi 730643 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973242730643</link>
      <description><![CDATA[<p>Tìm vi phân toàn phần của hàm số </p><p><img src="/file/1178165/21919183-10161546.png" alt="" width="176px" height="23px"></p> <img src="/file/1178165/14352208-24345054.png" alt="" width="213px" height="39px"> <img src="/file/1178165/14352209-17778899.png" alt="" width="166px" height="27px"> <img src="/file/1178165/14352211-30804749.png" alt="" width="151px" height="28px"> <img src="/file/1178165/14352210-25792371.png" alt="" width="155px" height="30px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:56 GMT</pubDate>
      <guid>8572154973242730643</guid>
    </item>
    <item>
      <title>Câu hỏi 730630 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973092730630</link>
      <description><![CDATA[<p><img src="/file/1178165/21919168-36038289.png" alt="" width="165px" height="25px"></p> – x. cos(xy) –ycos(xy) y.cos(xy) x.cos(xy)]]></description>
      <pubDate>Tue, 20 January 2026 10:52:56 GMT</pubDate>
      <guid>8572154973092730630</guid>
    </item>
    <item>
      <title>Câu hỏi 730631 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973092730631</link>
      <description><![CDATA[<p><img src="/file/1178165/21919177-32494840.png" alt="" width="210px" height="27px"></p> <img src="/file/1178165/14352185-14836356.png" alt="" width="91px" height="44px"> <img src="/file/1178165/14352184-24018105.png" alt="" width="93px" height="45px"> <img src="/file/1178165/14352186-66418347.png" alt="" width="86px" height="44px"> <img src="/file/1178165/14352187-60894213.png" alt="" width="81px" height="35px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:56 GMT</pubDate>
      <guid>8572154973092730631</guid>
    </item>
    <item>
      <title>Câu hỏi 730650 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730650</link>
      <description><![CDATA[<p>Cho hàm ẩn z = f(x, y) xác định bởi phương trình: <img src="/file/1178165/21919182-62855489.png" alt="" width="181px" height="28px"></p><p>Tìm dz</p> <img src="/file/1178165/14352206-53406450.png" alt="" width="155px" height="40px"> <img src="/file/1178165/14352207-10896009.png" alt="" width="163px" height="39px"> <img src="/file/1178165/14352204-28828491.png" alt="" width="145px" height="39px"> <img src="/file/1178165/14352205-58129833.png" alt="" width="149px" height="40px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973282730650</guid>
    </item>
    <item>
      <title>Câu hỏi 730641 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973202730641</link>
      <description><![CDATA[<p>Tính <img src="/file/1178165/21916863-43086875.png" alt="" width="56px" height="34px"></p> <img src="/file/1178165/14349114-3383718.png" alt="" width="92px" height="38px"> <img src="/file/1178165/14349115-30453462.png" alt="" width="91px" height="39px"> <img src="/file/1178165/14349113-375968.png" alt="" width="93px" height="37px"> <img src="/file/1178165/14349112-52237557.png" alt="" width="81px" height="25px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973202730641</guid>
    </item>
    <item>
      <title>Câu hỏi 730640 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973202730640</link>
      <description><![CDATA[<p><img src="/file/1178165/21916865-45032243.png" alt="" width="79px" height="37px"></p> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>+</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mi>∞</mml:mi><mml:mi>&nbsp;</mml:mi></mml:math> -1 0 1]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973202730640</guid>
    </item>
    <item>
      <title>Câu hỏi 730639 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973202730639</link>
      <description><![CDATA[<p><img src="/file/1178165/21919172-40362448.png" alt="" width="156px" height="61px"></p> <img src="/file/1178165/14352166-30542218.png" alt="" style="width: 35.15pt; height: 18.4pt"> <img src="/file/1178165/14352165-48132822.png" alt="" width="108px" height="23px"> -ysinx <img src="/file/1178165/14352164-27717712.png" alt="" width="118px" height="25px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973202730639</guid>
    </item>
    <item>
      <title>Câu hỏi 730632 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973122730632</link>
      <description><![CDATA[<p>Tìm cực trị của hàm số: </p><p><img src="/file/1178165/21919191-7815975.png" alt="" width="181px" height="28px"></p> Hàm số đạt cực đại taị <img src="/file/1178165/14352241-29114202.png" alt="" width="65px" height="23px"><br>Giá trị cực đại là: - 125 Hàm số đạt cực tiểu taị <img src="/file/1178165/14352240-3234911.png" alt="" width="61px" height="23px"><br>Giá trị cực tiểu là: 0 Hàm số đạt cực tiểu taị <img src="/file/1178165/14352243-9440199.png" alt="" width="61px" height="23px"><br>Giá trị cực tiểu là: 0 Hàm số đạt cực tiểu taị <img src="/file/1178165/14352242-60701234.png" alt="" width="65px" height="23px"><br>Giá trị cực tiểu là: - 125]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973122730632</guid>
    </item>
    <item>
      <title>Câu hỏi 730633 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973122730633</link>
      <description><![CDATA[<p><img src="/file/1178165/21919179-53606711.png" alt="" width="233px" height="44px"></p> <img src="/file/1178165/14352194-21933905.png" alt="" width="167px" height="36px"> <img src="/file/1178165/14352195-63187419.png" alt="" width="190px" height="21px"> <img src="/file/1178165/14352193-47176343.png" alt="" width="197px" height="24px"> <img src="/file/1178165/14352192-12698356.png" alt="" width="233px" height="26px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973122730633</guid>
    </item>
    <item>
      <title>Câu hỏi 730634 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973122730634</link>
      <description><![CDATA[<p>Tìm cực trị của hàm số: </p><p><img src="/file/1178165/21919189-48624250.png" alt="" width="207px" height="28px"></p> Hàm số đạt cực đại taị <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:msub><mml:mrow><mml:mi>M</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mo>;</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo></mml:math><br>Giá trị cực đại là: 8 Hàm số đạt cực đại taị <img src="/file/1178165/14352234-32974871.png" alt="" width="72px" height="23px"><br>Giá trị cực đại là: 0 Hàm số đạt cực tiểu taị <img src="/file/1178165/14352232-34965068.png" alt="" width="60px" height="22px"><br>Giá trị cực tiểu là: 8 Hàm số đạt cực tiểu taị <img src="/file/1178165/14352235-28338386.png" alt="" width="72px" height="23px"><br>Giá trị cực tiểu là: 0]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973122730634</guid>
    </item>
    <item>
      <title>Câu hỏi 730635 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973122730635</link>
      <description><![CDATA[<p>Tính </p><p><img src="/file/1178165/21916861-46794527.png" alt="" width="75px" height="34px"></p> -1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>+</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mi>∞</mml:mi><mml:mi>&nbsp;</mml:mi></mml:math> 0 1]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973122730635</guid>
    </item>
    <item>
      <title>Câu hỏi 730636 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973122730636</link>
      <description><![CDATA[<p><img src="/file/1178165/21916867-62075772.png" alt="" width="74px" height="34px"></p> 0 -1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>+</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mi>∞</mml:mi><mml:mi>&nbsp;</mml:mi></mml:math> 1]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973122730636</guid>
    </item>
    <item>
      <title>Câu hỏi 730637 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973122730637</link>
      <description><![CDATA[<p>Tính   <img src="/file/1178165/21916856-45038152.png" alt="" width="74px" height="35px"></p> <img src="/file/1178165/14349085-24211670.png" alt="" width="60px" height="17px"> <img src="/file/1178165/14349087-14988220.png" alt="" width="29px" height="16px"> <img src="/file/1178165/14349086-16578438.png" alt="" width="29px" height="14px"> <img src="/file/1178165/14349084-2690185.png" alt="" width="32px" height="13px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:53 GMT</pubDate>
      <guid>8572154973122730637</guid>
    </item>
    <item>
      <title>Câu hỏi 730653 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730653</link>
      <description><![CDATA[<p>Cho hàm số z=z(x, y) xác định bởi phương trình: <img src="/file/1178165/21919184-12156768.png" alt="" width="166px" height="27px"></p><p>Tìm dz?</p> <img src="/file/1178165/14352213-45174131.png" alt="" width="174px" height="45px"> <img src="/file/1178165/14352215-35225966.png" alt="" width="206px" height="36px"> <img src="/file/1178165/14352214-3913996.png" alt="" width="174px" height="34px"> <img src="/file/1178165/14352212-42302050.png" alt="" width="205px" height="39px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:45 GMT</pubDate>
      <guid>8572154973282730653</guid>
    </item>
    <item>
      <title>Câu hỏi 730652 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730652</link>
      <description><![CDATA[<p><img src="/file/1178165/21919169-55909147.png" alt="" width="165px" height="21px"></p> x.cos(xy) –ycos(xy) y.cos(xy) – x. cos(xy)]]></description>
      <pubDate>Tue, 20 January 2026 10:52:45 GMT</pubDate>
      <guid>8572154973282730652</guid>
    </item>
    <item>
      <title>Câu hỏi 730638 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973202730638</link>
      <description><![CDATA[<p>Tìm vi phân toàn phần cấp 1 của hàm số </p><p>z = cos(x+y)</p> dz = -sin(x+y)dx -sin(x+y)dy dz=sin(x+y)dx +sin(x+y)dy 1 0]]></description>
      <pubDate>Tue, 20 January 2026 10:52:45 GMT</pubDate>
      <guid>8572154973202730638</guid>
    </item>
    <item>
      <title>Câu hỏi 730642 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973202730642</link>
      <description><![CDATA[<p>Tính   <img src="/file/1178165/21916855-60057505.png" alt="" width="112px" height="32px"></p> <img src="/file/1178165/14349081-32819733.png" alt="" width="82px" height="18px"> <img src="/file/1178165/14349080-3646637.png" alt="" width="70px" height="19px"> <img src="/file/1178165/14349083-41152746.png" alt="" width="82px" height="23px"> <img src="/file/1178165/14349082-26942148.png" alt="" width="96px" height="35px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:45 GMT</pubDate>
      <guid>8572154973202730642</guid>
    </item>
    <item>
      <title>Câu hỏi 730656 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730656</link>
      <description><![CDATA[<p>Tính <img src="/file/1178165/21916873-30603618.png" alt="" width="58px" height="34px"></p> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>π</mml:mi><mml:mi>&nbsp;</mml:mi></mml:math> <img src="/file/1178165/14349153-39653857.png" alt="" width="43px" height="57px"> 0 <img src="/file/1178165/14349154-21340395.png" alt="" width="53px" height="47px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:41 GMT</pubDate>
      <guid>8572154973282730656</guid>
    </item>
    <item>
      <title>Câu hỏi 730655 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730655</link>
      <description><![CDATA[<p>Tính <img src="/file/1178165/21916870-36066065.png" alt="" width="136px" height="72px"></p> Ln2 2ln2 <img src="/file/1178165/14349143-56159133.png" alt="" style="width: 33.65pt; height: 36.45pt"> -2ln2]]></description>
      <pubDate>Tue, 20 January 2026 10:52:41 GMT</pubDate>
      <guid>8572154973282730655</guid>
    </item>
    <item>
      <title>Câu hỏi 730644 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973242730644</link>
      <description><![CDATA[<p>Cho hàm số <img src="/file/1178165/21919185-34731002.png" alt="" width="190px" height="23px"></p><p>Tìm dz(0; 1)?</p> 5 -5 dz(0;1) =- dx - 4dy dz(0;1) = dx + 4dy]]></description>
      <pubDate>Tue, 20 January 2026 10:52:41 GMT</pubDate>
      <guid>8572154973242730644</guid>
    </item>
    <item>
      <title>Câu hỏi 730645 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973242730645</link>
      <description><![CDATA[<p><img src="/file/1178165/21919174-42750725.png" alt="" width="135px" height="55px"></p> <img src="/file/1178165/14352175-39564799.png" alt="" width="95px" height="21px"> <img src="/file/1178165/14352174-26765710.png" alt="" width="108px" height="23px"> <img src="/file/1178165/14352172-49212206.png" alt="" width="139px" height="27px"> <img src="/file/1178165/14352173-40256670.png" alt="" width="118px" height="24px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:41 GMT</pubDate>
      <guid>8572154973242730645</guid>
    </item>
    <item>
      <title>Câu hỏi 730646 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973242730646</link>
      <description><![CDATA[<p>Tính   <img src="/file/1178165/21916857-6086307.png" alt="" width="82px" height="35px"></p> <img src="/file/1178165/14349089-23228850.png" alt="" width="55px" height="18px"> <img src="/file/1178165/14349091-2488722.png" alt="" width="27px" height="16px"> <img src="/file/1178165/14349088-54776766.png" alt="" width="54px" height="16px"> <img src="/file/1178165/14349090-7733065.png" alt="" width="29px" height="17px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:41 GMT</pubDate>
      <guid>8572154973242730646</guid>
    </item>
    <item>
      <title>Câu hỏi 730647 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973242730647</link>
      <description><![CDATA[<p>Tính <img src="/file/1178165/21916862-52952190.png" alt="" width="71px" height="33px"></p> -1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>+</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mi>∞</mml:mi><mml:mi>&nbsp;</mml:mi></mml:math> 1 0]]></description>
      <pubDate>Tue, 20 January 2026 10:52:41 GMT</pubDate>
      <guid>8572154973242730647</guid>
    </item>
    <item>
      <title>Câu hỏi 730648 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973242730648</link>
      <description><![CDATA[<p>Tính   <img src="/file/1178165/21916854-2457719.png" alt="" width="65px" height="28px"></p> <img src="/file/1178165/14349078-46846859.png" alt="" width="39px" height="35px"> <img src="/file/1178165/14349079-18968549.png" alt="" width="60px" height="35px"> <img src="/file/1178165/14349077-64857530.png" alt="" width="21px" height="16px"> <img src="/file/1178165/14349076-22119473.png" alt="" width="30px" height="19px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:41 GMT</pubDate>
      <guid>8572154973242730648</guid>
    </item>
    <item>
      <title>Câu hỏi 730651 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730651</link>
      <description><![CDATA[<p>Tìm cực trị của hàm số: </p><p><img src="/file/1178165/21919190-36597996.png" alt="" width="176px" height="25px"></p> Hàm số đạt cực đại taị <img src="/file/1178165/14352239-3939144.png" alt="" width="61px" height="23px"><br>Giá trị cực đại là: 1 Hàm số đạt cực đại taị <img src="/file/1178165/14352237-11647694.png" alt="" width="101px" height="23px"><br>Giá trị cực đại là: - 6911 Hàm số đạt cực tiểu taị <img src="/file/1178165/14352236-60946511.png" alt="" width="101px" height="23px"><br>Giá trị cực tiểu là: - 6911 Hàm số đạt cực tiểu taị <img src="/file/1178165/14352238-37720384.png" alt="" width="61px" height="23px"><br>Giá trị cực tiểu là: 1]]></description>
      <pubDate>Tue, 20 January 2026 10:52:37 GMT</pubDate>
      <guid>8572154973282730651</guid>
    </item>
    <item>
      <title>Câu hỏi 730654 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973282730654</link>
      <description><![CDATA[<p>Tính   <img src="/file/1178165/21916851-3914242.png" alt="" width="91px" height="28px"></p> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>x</mml:mi><mml:mo>.</mml:mo><mml:mi>c</mml:mi><mml:mi>o</mml:mi><mml:mi>s</mml:mi><mml:mi>x</mml:mi></mml:math> Cosx <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>-</mml:mo><mml:mi>x</mml:mi><mml:mo>.</mml:mo><mml:mi>c</mml:mi><mml:mi>o</mml:mi><mml:mi>s</mml:mi><mml:mi>x</mml:mi><mml:mo>+</mml:mo><mml:mi>s</mml:mi><mml:mi>i</mml:mi><mml:mi>n</mml:mi><mml:mi>x</mml:mi></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>x</mml:mi><mml:mo>.</mml:mo><mml:mi>s</mml:mi><mml:mi>i</mml:mi><mml:mi>n</mml:mi><mml:mi>x</mml:mi></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:37 GMT</pubDate>
      <guid>8572154973282730654</guid>
    </item>
    <item>
      <title>Câu hỏi 730680 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730680</link>
      <description><![CDATA[<p>Xét sự độc lập tuyến tính của hệ véc tơ</p><p><img src="/file/1178165/21916835-47096010.png" alt="" width="226px" height="61px"></p> Không xét được Hệ véc tơ phụ thuộc tuyến tính Hệ véc tơ độc lập tuyến tính]]></description>
      <pubDate>Tue, 20 January 2026 10:52:29 GMT</pubDate>
      <guid>8572154973432730680</guid>
    </item>
    <item>
      <title>Câu hỏi 730678 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730678</link>
      <description><![CDATA[<p>Xét sự độc lập tuyến tính của hệ véc tơ</p><p><img src="/file/1178165/21916839-62458233.png" alt="" width="221px" height="72px"></p> Hệ độc lập tuyến tính với mọi k k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mn>6</mml:mn></mml:math> k = - 6]]></description>
      <pubDate>Tue, 20 January 2026 10:52:29 GMT</pubDate>
      <guid>8572154973432730678</guid>
    </item>
    <item>
      <title>Câu hỏi 730677 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730677</link>
      <description><![CDATA[<p>Tìm k để hệ véc tơ sau độc lập tuyến tính</p><p><img src="/file/1178165/21916840-24517452.png" alt="" width="228px" height="67px"></p> <img src="/file/1178165/14349024-22265380.png" alt="" width="45px" height="28px"> <img src="/file/1178165/14349022-39756633.png" alt="" width="58px" height="25px"> Hệ độc lập tuyến tính với mọi k <img src="/file/1178165/14349021-19330484.png" alt="" width="58px" height="23px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:29 GMT</pubDate>
      <guid>8572154973432730677</guid>
    </item>
    <item>
      <title>Câu hỏi 730668 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973412730668</link>
      <description><![CDATA[<p>Tìm hạng của hệ véc tơ</p><p><img src="/file/1178165/21916833-65204782.png" alt="" width="222px" height="76px"></p> 4 2 3 1]]></description>
      <pubDate>Tue, 20 January 2026 10:52:29 GMT</pubDate>
      <guid>8572154973412730668</guid>
    </item>
    <item>
      <title>Câu hỏi 730659 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973362730659</link>
      <description><![CDATA[<p>Tìn k để hệ véc tơ độc lập tuyến tính </p><p><img src="/file/1178165/21916843-30809419.png" alt="" width="256px" height="75px"></p> k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn>3</mml:mn></mml:math> Hệ phụ thuộc tuyến tính với mọi k k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:math> k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mn>3</mml:mn></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:29 GMT</pubDate>
      <guid>8572154973362730659</guid>
    </item>
    <item>
      <title>Câu hỏi 730660 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973362730660</link>
      <description><![CDATA[<p><img src="/file/1178165/21916847-45734414.png" alt="" width="275px" height="76px"> </p><p>Hãy biểu diễn tuyến tính véc tơ X qua hệ </p><p>véc tơ S</p> <img src="/file/1178165/14349048-8956548.png" alt="" width="149px" height="23px"> <img src="/file/1178165/14349049-13500073.png" alt="" width="133px" height="21px"> Không biểu diễn được <img src="/file/1178165/14349051-54391798.png" alt="" width="130px" height="23px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:29 GMT</pubDate>
      <guid>8572154973362730660</guid>
    </item>
    <item>
      <title>Câu hỏi 730661 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973362730661</link>
      <description><![CDATA[<p>Trong không gian R4 cho hệ véc tơ: </p><p><img src="/file/1178165/21916844-51751889.png" alt="" width="269px" height="69px">là: </p> <img src="/file/1178165/14349038-31153498.png" alt="" width="95px" height="38px"> <img src="/file/1178165/14349039-11946027.png" alt="" width="100px" height="39px"> <img src="/file/1178165/14349037-63113823.png" alt="" width="102px" height="27px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:29 GMT</pubDate>
      <guid>8572154973362730661</guid>
    </item>
    <item>
      <title>Câu hỏi 730675 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730675</link>
      <description><![CDATA[<p>Tìn k để hệ véc tơ độc lập tuyến tính </p><p><img src="/file/1178165/21916843-30809419.png" alt="" width="256px" height="75px"></p> Hệ phụ thuộc tuyến tính với mọi k k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mn>3</mml:mn></mml:math> k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:math> k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn>3</mml:mn></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:27 GMT</pubDate>
      <guid>8572154973432730675</guid>
    </item>
    <item>
      <title>Câu hỏi 730671 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730671</link>
      <description><![CDATA[<p>Tìm hạng của hệ véc tơ</p><p><img src="/file/1178165/21916825-55909147.png" alt="" width="241px" height="122px"></p> 2 1 4 3]]></description>
      <pubDate>Tue, 20 January 2026 10:52:27 GMT</pubDate>
      <guid>8572154973432730671</guid>
    </item>
    <item>
      <title>Câu hỏi 730662 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973382730662</link>
      <description><![CDATA[<p>Cho hệ véc tơ: </p><p><img src="/file/1178165/21916848-19764141.png" alt="" width="301px" height="87px"></p><p>Tìm k để véc tơ X biểu diễn tuyến tính được qua hệ véc tơ S.</p> Không tồn tại k k = 4 k = - 4 Với mọi k]]></description>
      <pubDate>Tue, 20 January 2026 10:52:27 GMT</pubDate>
      <guid>8572154973382730662</guid>
    </item>
    <item>
      <title>Câu hỏi 730663 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973382730663</link>
      <description><![CDATA[<p>Xét sự độc lập tuyến tính của hệ véc tơ</p><p><img src="/file/1178165/21916837-56680499.png" alt="" width="222px" height="72px"></p> <img src="/file/1178165/14349012-40362448.png" alt="" width="54px" height="24px"> thì hệ độc lập tuyến tính<br><img src="/file/1178165/14349012-27717712.png" alt="" width="48px" height="28px">, hệ phụ thuộc tuyến tính Hệ độc lập tuyến tính với mọi k <img src="/file/1178165/14349013-48132822.png" alt="" width="48px" height="28px"> thì hệ độc lập tuyến tính<br><img src="/file/1178165/14349013-30542218.png" alt="" width="54px" height="24px">,hệ phụ thuộc tuyến tính Hệ phụ thuộc tuyến tính với mọi k]]></description>
      <pubDate>Tue, 20 January 2026 10:52:27 GMT</pubDate>
      <guid>8572154973382730663</guid>
    </item>
    <item>
      <title>Câu hỏi 730664 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973382730664</link>
      <description><![CDATA[<p>Tìm hạng của hệ véc tơ</p><p><img src="/file/1178165/21916830-25773083.png" alt="" width="200px" height="91px"></p> 4 3 1 2]]></description>
      <pubDate>Tue, 20 January 2026 10:52:27 GMT</pubDate>
      <guid>8572154973382730664</guid>
    </item>
    <item>
      <title>Câu hỏi 730665 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973382730665</link>
      <description><![CDATA[<p>Tìm hạng của hệ véc tơ</p><p><img src="/file/1178165/21916829-2863675.png" alt="" width="198px" height="91px"></p> 3 1 2 4]]></description>
      <pubDate>Tue, 20 January 2026 10:52:27 GMT</pubDate>
      <guid>8572154973382730665</guid>
    </item>
    <item>
      <title>Câu hỏi 730666 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973412730666</link>
      <description><![CDATA[<p>Tìm hạng của hệ véc tơ</p><p><img src="/file/1178165/21916827-32347029.png" alt="" width="245px" height="128px"></p> 1 2 4 3]]></description>
      <pubDate>Tue, 20 January 2026 10:52:24 GMT</pubDate>
      <guid>8572154973412730666</guid>
    </item>
    <item>
      <title>Câu hỏi 730667 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973412730667</link>
      <description><![CDATA[<p>Xét sự độc lập tuyến tính của hệ véc tơ:</p><p><img src="/file/1178165/21916834-49972132.png" alt="" width="228px" height="77px"></p> Hệ véc tơ độc lập tuyến tính Hệ véc tơ phụ thuộc tuyến tính Không xét được]]></description>
      <pubDate>Tue, 20 January 2026 10:52:24 GMT</pubDate>
      <guid>8572154973412730667</guid>
    </item>
    <item>
      <title>Câu hỏi 730669 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973412730669</link>
      <description><![CDATA[<p>Xét sự độc lập tuyến tính của hệ véc tơ:</p><p><img src="/file/1178165/21916836-21210914.png" alt="" width="228px" height="75px"></p> Không xét được Hệ véc tơ độc lập tuyến tính Hệ véc tơ phụ thuộc tuyến tính]]></description>
      <pubDate>Tue, 20 January 2026 10:52:24 GMT</pubDate>
      <guid>8572154973412730669</guid>
    </item>
    <item>
      <title>Câu hỏi 730670 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973412730670</link>
      <description><![CDATA[<p>Tìm k để hệ véc tơ độc lập tuyến tính </p><p><img src="/file/1178165/21916841-66170694.png" alt="" width="228px" height="72px"></p> k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>≠</mml:mo><mml:mn>96</mml:mn></mml:math> Hệ độc lập tuyến tính với mọi k k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>=</mml:mo><mml:mn>96</mml:mn></mml:math> k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn>96</mml:mn></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:24 GMT</pubDate>
      <guid>8572154973412730670</guid>
    </item>
    <item>
      <title>Câu hỏi 730672 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730672</link>
      <description><![CDATA[<p>Tìm k để hệ véc tơ phụ thuộc tuyến tính </p><p><img src="/file/1178165/21916842-4582792.png" alt="" width="232px" height="79px"></p> Hệ phụ thuộc tuyến tính với mọi k k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn>5</mml:mn></mml:math> k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>≠</mml:mo><mml:mn>5</mml:mn></mml:math> k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mo>=</mml:mo><mml:mn>5</mml:mn></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:22 GMT</pubDate>
      <guid>8572154973432730672</guid>
    </item>
    <item>
      <title>Câu hỏi 730673 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730673</link>
      <description><![CDATA[<p>Tìm giá trị k để hệ véc tơ phụ thuộc tuyến tính</p><p><img src="/file/1178165/21916838-6444509.png" alt="" width="222px" height="80px"></p> k = 29 k = 1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>k</mml:mi><mml:mo>≠</mml:mo><mml:mn>29</mml:mn></mml:math> Hệ phụ thuộc tuyến tính với mọi k]]></description>
      <pubDate>Tue, 20 January 2026 10:52:22 GMT</pubDate>
      <guid>8572154973432730673</guid>
    </item>
    <item>
      <title>Câu hỏi 730674 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730674</link>
      <description><![CDATA[<p>Tìm hạng của hệ véc tơ</p><p><img src="/file/1178165/21916828-22687807.png" alt="" width="198px" height="96px"></p> 3 2 4 1]]></description>
      <pubDate>Tue, 20 January 2026 10:52:22 GMT</pubDate>
      <guid>8572154973432730674</guid>
    </item>
    <item>
      <title>Câu hỏi 730676 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730676</link>
      <description><![CDATA[<p>Xét hạng của hệ véc tơ</p><p><img src="/file/1178165/21916824-36038289.png" alt="" width="280px" height="34px"></p> 1 3 2]]></description>
      <pubDate>Tue, 20 January 2026 10:52:22 GMT</pubDate>
      <guid>8572154973432730676</guid>
    </item>
    <item>
      <title>Câu hỏi 730679 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973432730679</link>
      <description><![CDATA[<p>Trong không gian R4 cho hệ véc tơ:</p><p><img src="/file/1178165/21916846-22162638.png" alt="" width="285px" height="80px"></p><p>Tìm k để véc tơ X biểu diễn tuyến tính được qua hệ véc tơ S.</p> Với mọi k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>k</mml:mi><mml:mo>≠</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mn>38</mml:mn></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>k</mml:mi><mml:mo>=</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mn>38</mml:mn></mml:math> Không tồn tại k]]></description>
      <pubDate>Tue, 20 January 2026 10:52:22 GMT</pubDate>
      <guid>8572154973432730679</guid>
    </item>
    <item>
      <title>Câu hỏi 730681 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973472730681</link>
      <description><![CDATA[<p>Tìm m để hệ phương trình có nghiệm duy nhất</p><p><img src="/file/1178165/21901831-35408851.png" alt="" width="165px" height="64px"></p> Không tồn tại m <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:math> Với mọi m]]></description>
      <pubDate>Tue, 20 January 2026 10:52:18 GMT</pubDate>
      <guid>8572154973472730681</guid>
    </item>
    <item>
      <title>Câu hỏi 730682 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973472730682</link>
      <description><![CDATA[<p>Tìm k để hệ phương trình vô nghiệm</p>
<p><img src="/file/1178165/21901835-10237906.png" alt="" width="182px" height="74px"></p> k≠-2 k≠&nbsp;-4 Không tồn tại k k≠-2&nbsp;và&nbsp;k≠&nbsp;-4]]></description>
      <pubDate>Tue, 20 January 2026 10:52:18 GMT</pubDate>
      <guid>8572154973472730682</guid>
    </item>
    <item>
      <title>Câu hỏi 730691 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973552730691</link>
      <description><![CDATA[<p>Tìm nghiệm của hệ phương trình sau: </p><p><img src="/file/1178165/21901812-14708928.png" alt="" width="159px" height="64px"></p> (3; 1; 1) (3; 1; -1) Hệ phương trình vô nghiệm Hệ phương trình vô số nghiệm]]></description>
      <pubDate>Tue, 20 January 2026 10:52:17 GMT</pubDate>
      <guid>8572154973552730691</guid>
    </item>
    <item>
      <title>Câu hỏi 730683 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973482730683</link>
      <description><![CDATA[<p>Tìm số nghiệm của hệ phương trình</p><p><img src="/file/1178165/21901817-61810987.png" alt="" width="202px" height="63px"></p> Vô số nghiệm Vô nghiệm Có nghiệm duy nhất]]></description>
      <pubDate>Tue, 20 January 2026 10:52:17 GMT</pubDate>
      <guid>8572154973482730683</guid>
    </item>
    <item>
      <title>Câu hỏi 730684 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973482730684</link>
      <description><![CDATA[<p>Tìm m để hệ phương trình có nghiệm duy nhất</p><p><img src="/file/1178165/21901826-9718880.png" alt="" width="160px" height="60px"></p> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>≠</mml:mo><mml:mn>3</mml:mn></mml:math> m = 3 m = 0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>≠</mml:mo><mml:mn>0</mml:mn></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:17 GMT</pubDate>
      <guid>8572154973482730684</guid>
    </item>
    <item>
      <title>Câu hỏi 730685 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973482730685</link>
      <description><![CDATA[<p>Giải hệ phương trình</p><p><img src="/file/1178165/21901821-19462315.png" alt="" width="158px" height="81px"></p> (0; 0; 0) Vô số nghiệm Vô nghiệm]]></description>
      <pubDate>Tue, 20 January 2026 10:52:17 GMT</pubDate>
      <guid>8572154973482730685</guid>
    </item>
    <item>
      <title>Câu hỏi 730686 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973482730686</link>
      <description><![CDATA[<p>Tìm số nghiệm của hệ phương trình</p><p><img src="/file/1178165/21901814-24571699.png" alt="" width="181px" height="63px"></p> Vô nghiệm Vô số nghiệm Có nghiệm duy nhất]]></description>
      <pubDate>Tue, 20 January 2026 10:52:17 GMT</pubDate>
      <guid>8572154973482730686</guid>
    </item>
    <item>
      <title>Câu hỏi 730697 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730697</link>
      <description><![CDATA[<p>Tìm m để hệ phương trình vô nghiệm <img src="/file/1178165/21901827-35817970.png" alt="" width="169px" height="64px"></p>    ]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973582730697</guid>
    </item>
    <item>
      <title>Câu hỏi 730695 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730695</link>
      <description><![CDATA[<p>Tìm nghiệm của hệ phương trình sau: </p><p><img src="/file/1178165/21901813-65271488.png" alt="" width="150px" height="63px"></p>    ]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973582730695</guid>
    </item>
    <item>
      <title>Câu hỏi 730694 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730694</link>
      <description><![CDATA[<p>Tìm m để hệ phương trình sau vô nghiệm</p><p><img src="/file/1178165/21901832-28522820.png" alt="" width="193px" height="123px"></p>    ]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973582730694</guid>
    </item>
    <item>
      <title>Câu hỏi 730693 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730693</link>
      <description><![CDATA[<p>Tìm nghiệm của hệ phương trình sau: <img src="/file/1178165/21901818-19427976.png" alt="" width="198px" height="98px"></p>    ]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973582730693</guid>
    </item>
    <item>
      <title>Câu hỏi 730687 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973552730687</link>
      <description><![CDATA[<p>Giải và biện luận số nghiệm của hệ phương trình:</p><p><img src="/file/1178165/21901828-12384191.png" alt="" width="161px" height="60px"></p> <img src="/file/1178165/14339166-50952441.png" alt="" width="144px" height="139px"> <img src="/file/1178165/14339164-63595384.png" alt="" width="165px" height="108px"> <img src="/file/1178165/14339163-44348856.png" alt="" width="185px" height="107px"> <img src="/file/1178165/14339165-35487544.png" alt="" width="174px" height="97px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973552730687</guid>
    </item>
    <item>
      <title>Câu hỏi 730688 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973552730688</link>
      <description><![CDATA[<p>Tìm m để hệ phương trình vô nghiệm</p><p><img src="/file/1178165/21901829-55918788.png" alt="" width="154px" height="60px"></p> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:math> Hệ luôn có nghiệm với mọi m Với mọi m]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973552730688</guid>
    </item>
    <item>
      <title>Câu hỏi 730689 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973552730689</link>
      <description><![CDATA[<p>Tìm m để hệ phương trình có vô số nghiệm</p><p><img src="/file/1178165/21901830-55494036.png" alt="" width="153px" height="64px"></p> Không tồn tại m <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:math> Với mọi m <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973552730689</guid>
    </item>
    <item>
      <title>Câu hỏi 730690 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973552730690</link>
      <description><![CDATA[<p>Tìm k để hệ phương trình có nghiệm duy nhất</p>
<p><img src="data:image/png;base64,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" alt=""></p> m≠&nbsp;-4 m≠2&nbsp;và&nbsp;m≠&nbsp;-4 m≠-2 Không tồn tại m]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973552730690</guid>
    </item>
    <item>
      <title>Câu hỏi 730692 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973552730692</link>
      <description><![CDATA[<p>Tìm số nghiệm của hệ phương trình:</p><p><img src="/file/1178165/21901820-27222015.png" alt="" width="197px" height="80px"></p> Vô số nghiệm Vô nghiệm Có nghiệm duy nhất]]></description>
      <pubDate>Tue, 20 January 2026 10:52:10 GMT</pubDate>
      <guid>8572154973552730692</guid>
    </item>
    <item>
      <title>Câu hỏi 730696 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730696</link>
      <description><![CDATA[<p>Tìm m để hệ phương trình vô nghiệm</p><p><img src="/file/1178165/21901829-55918788.png" alt="" width="154px" height="60px"></p> Với mọi m <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:math> Hệ luôn có nghiệm với mọi m]]></description>
      <pubDate>Tue, 20 January 2026 10:52:07 GMT</pubDate>
      <guid>8572154973582730696</guid>
    </item>
    <item>
      <title>Câu hỏi 730698 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730698</link>
      <description><![CDATA[<p>Tìm số nghiệm của hệ phương trình</p><p><img src="/file/1178165/21901816-44150589.png" alt="" width="168px" height="63px"></p> Vô nghiệm Vô số nghiệm Có nghiệm duy nhất]]></description>
      <pubDate>Tue, 20 January 2026 10:52:07 GMT</pubDate>
      <guid>8572154973582730698</guid>
    </item>
    <item>
      <title>Câu hỏi 730699 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730699</link>
      <description><![CDATA[<p>Tìm nghiệm của hệ phương trình sau: </p><p><img src="/file/1178165/21901819-40634061.png" alt="" width="163px" height="85px"></p> <img src="/file/1178165/14339134-30162236.png" alt="" width="117px" height="42px"> Vô nghiệm <img src="/file/1178165/14339135-3024668.png" alt="" width="128px" height="44px"> (10; -1; 2)]]></description>
      <pubDate>Tue, 20 January 2026 10:52:07 GMT</pubDate>
      <guid>8572154973582730699</guid>
    </item>
    <item>
      <title>Câu hỏi 730700 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730700</link>
      <description><![CDATA[<p>Tìm m để hệ phương trình sau vô số nghiệm</p><p><img src="/file/1178165/21901833-55378796.png" alt="" width="222px" height="126px"></p> m = -1 Hệ vô nghiệm với mọi m Hệ vô số nghiệm với mọi m m = 1]]></description>
      <pubDate>Tue, 20 January 2026 10:52:07 GMT</pubDate>
      <guid>8572154973582730700</guid>
    </item>
    <item>
      <title>Câu hỏi 730701 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730701</link>
      <description><![CDATA[<p>Tìm số nghiệm của hệ phương trình</p><p><img src="/file/1178165/21901815-19818701.png" alt="" width="182px" height="59px"></p> Vô nghiệm Vô số nghiệm Có nghiệm duy nhất]]></description>
      <pubDate>Tue, 20 January 2026 10:52:07 GMT</pubDate>
      <guid>8572154973582730701</guid>
    </item>
    <item>
      <title>Câu hỏi 730702 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973582730702</link>
      <description><![CDATA[<p>Tìm số nghiệm của hệ phương trình: <img src="/file/1178165/21901823-28057958.png" alt="" width="250px" height="98px"></p> Vô nghiệm Có nghiệm duy nhât Vô số nghiệm]]></description>
      <pubDate>Tue, 20 January 2026 10:52:07 GMT</pubDate>
      <guid>8572154973582730702</guid>
    </item>
    <item>
      <title>Câu hỏi 730703 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973622730703</link>
      <description><![CDATA[<p>Kết quả của phép nhân hai ma trận: <img src="/file/1178165/21901796-4396509.png" alt="" width="160px" height="60px"></p> <p><img src="/file/1178165/14339045-39568588.png" alt="" width="75px" height="60px"> </p> <img src="/file/1178165/14339047-50939023.png" alt="" width="82px" height="64px"> <img src="/file/1178165/14339046-20572972.png" alt="" width="55px" height="69px"> <img src="/file/1178165/14339048-55798031.png" alt="" width="81px" height="49px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973622730703</guid>
    </item>
    <item>
      <title>Câu hỏi 730704 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973622730704</link>
      <description><![CDATA[<p>Tính định thức:</p><p><img src="/file/1178165/21901787-10250462.png" alt="" width="71px" height="69px"></p> 50 -49 -1 -42]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973622730704</guid>
    </item>
    <item>
      <title>Câu hỏi 730705 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973632730705</link>
      <description><![CDATA[<p>Biện luận theo k hạng của ma trận</p><p><img src="/file/1178165/21901810-781194.png" alt="" width="158px" height="63px"></p> k = 1 hoặc k = -2 thì r(A) =2<br><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>k</mml:mi><mml:mo>≠</mml:mo><mml:mn>1</mml:mn><mml:mo>;</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mi>k</mml:mi><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mn>2</mml:mn><mml:mi>&nbsp;</mml:mi><mml:mi>t</mml:mi><mml:mi>h</mml:mi><mml:mi>ì</mml:mi><mml:mi>&nbsp;</mml:mi><mml:mi>r</mml:mi><mml:mfenced><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:mfenced><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:math> r(A) = 2 với mọi k r(A) = 3 với mọi k k = 1 thì r(A) =1<br>k=-2 thì r(A) = 2<br><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>k</mml:mi><mml:mo>≠</mml:mo><mml:mn>1</mml:mn><mml:mo>;</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mi>k</mml:mi><mml:mo>≠</mml:mo><mml:mo>-</mml:mo><mml:mn>2</mml:mn><mml:mi>&nbsp;</mml:mi><mml:mi>t</mml:mi><mml:mi>h</mml:mi><mml:mi>ì</mml:mi><mml:mi>&nbsp;</mml:mi><mml:mi>r</mml:mi><mml:mfenced><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:mfenced><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973632730705</guid>
    </item>
    <item>
      <title>Câu hỏi 730706 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973632730706</link>
      <description><![CDATA[<p>Tìm ma trận nghịch đảo của</p><p><img src="/file/1178165/21901799-53113763.png" alt="" width="105px" height="61px"></p> <img src="/file/1178165/14339058-7247562.png" alt="" width="123px" height="74px"> <img src="/file/1178165/14339060-50181678.png" alt="" width="128px" height="55px"> <img src="/file/1178165/14339057-8261825.png" alt="" width="143px" height="112px"> <img src="/file/1178165/14339059-65228065.png" alt="" width="143px" height="116px">]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973632730706</guid>
    </item>
    <item>
      <title>Câu hỏi 730707 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973632730707</link>
      <description><![CDATA[<p>Kết quả của phép nhân hai ma trận: </p><p><img src="/file/1178165/21901795-6551772.png" alt="" width="170px" height="67px"></p> <p><img src="/file/1178165/14339042-60931549.png" alt="" width="76px" height="60px"> </p> <img src="/file/1178165/14339044-36508475.png" alt="" width="98px" height="39px"> <img src="/file/1178165/14339043-11513037.png" alt="" width="97px" height="67px"> <p><img src="/file/1178165/14339041-58965955.png" alt="" width="85px" height="61px"> </p>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973632730707</guid>
    </item>
    <item>
      <title>Câu hỏi 730708 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973632730708</link>
      <description><![CDATA[<p>Tìm hạng của ma trận</p><p><img src="/file/1178165/21901804-12048390.png" alt="" width="149px" height="76px"></p> 0 1 3 2]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973632730708</guid>
    </item>
    <item>
      <title>Câu hỏi 730709 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973632730709</link>
      <description><![CDATA[<p>Biện luận theo k hạng của ma trận</p><p><img src="/file/1178165/21901811-55354896.png" alt="" width="219px" height="69px"></p> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>k</mml:mi><mml:mo>=</mml:mo><mml:mo>±</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mn>1</mml:mn><mml:mi>&nbsp;</mml:mi><mml:mi>t</mml:mi><mml:mi>h</mml:mi><mml:mi>ì</mml:mi><mml:mi>&nbsp;</mml:mi><mml:mi>r</mml:mi><mml:mfenced><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:mfenced><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:math><br><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>k</mml:mi><mml:mo>≠</mml:mo><mml:mo>±</mml:mo><mml:mi>&nbsp;</mml:mi><mml:mn>1</mml:mn><mml:mi>&nbsp;</mml:mi><mml:mi>t</mml:mi><mml:mi>h</mml:mi><mml:mi>ì</mml:mi><mml:mi>&nbsp;</mml:mi><mml:mi>r</mml:mi><mml:mfenced><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:mfenced><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:math> r(A) = 3 với mọi k r(A) = 2 với mọi k k = 1 thì r(A) =1<br>k = -1 thì r(A) =2<br><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>k</mml:mi><mml:mo>≠</mml:mo><mml:mo>±</mml:mo><mml:mn>1</mml:mn><mml:mi>&nbsp;</mml:mi><mml:mi>t</mml:mi><mml:mi>h</mml:mi><mml:mi>ì</mml:mi><mml:mi>&nbsp;</mml:mi><mml:mi>r</mml:mi><mml:mfenced><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:mfenced><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:math>]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973632730709</guid>
    </item>
    <item>
      <title>Câu hỏi 730710 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973632730710</link>
      <description><![CDATA[<p>Biện luận theo m hạng của ma trận</p><p><img src="/file/1178165/21901808-62354182.png" alt="" width="149px" height="91px"></p> r(A) = 2 với mọi m m=14 thì r(A) = 2<br><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"><mml:mi>m</mml:mi><mml:mo>≠</mml:mo><mml:mn>14</mml:mn><mml:mi>&nbsp;</mml:mi><mml:mi>t</mml:mi><mml:mi>h</mml:mi><mml:mi>ì</mml:mi><mml:mi>&nbsp;</mml:mi><mml:mi>r</mml:mi><mml:mfenced><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:mfenced><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:math> r(A) = 3 với mọi m]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973632730710</guid>
    </item>
    <item>
      <title>Câu hỏi 730711 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973632730711</link>
      <description><![CDATA[<p>Tìm hạng của ma trận</p><p><img src="/file/1178165/21901803-31164871.png" alt="" width="142px" height="81px"></p> 4 3 1 2]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973632730711</guid>
    </item>
    <item>
      <title>Câu hỏi 730712 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572154973632730712</link>
      <description><![CDATA[<p>Tìm hạng của ma trận</p><p><img src="/file/1178165/21901802-55658546.png" alt="" width="148px" height="79px"></p> 4 1 2 3]]></description>
      <pubDate>Tue, 20 January 2026 10:52:03 GMT</pubDate>
      <guid>8572154973632730712</guid>
    </item>
    <item>
      <title>Câu hỏi 672674 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572360332872672674</link>
      <description><![CDATA[<p>Tìm hạng của ma trận</p>
<p><img src="data:image/png;base64,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" alt=""></p> 3 4 1 2]]></description>
      <pubDate>Tue, 03 June 2025 03:44:28 GMT</pubDate>
      <guid>8572360332872672674</guid>
    </item>
    <item>
      <title>Câu hỏi 674514 - Toán cao cấp - BF30</title>
      <link>https://hou.hcode.me/q/toan-cao-cap-bf30/8572360366212674514</link>
      <description><![CDATA[<p>Tìm k để hệ phương trình có nghiệm duy nhất</p>
<p><img src="data:image/png;base64,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" alt=""></p> m≠&nbsp;-4 m≠2&nbsp;và&nbsp;m≠&nbsp;-4 m≠-2 Không tồn tại m]]></description>
      <pubDate>Tue, 03 June 2025 03:05:49 GMT</pubDate>
      <guid>8572360366212674514</guid>
    </item>
  </channel>
</rss>