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      <description>Chọn 2 ý</description>
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      <pubDate>2021-09-18 05:37:58 UTC</pubDate>
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         <pubDate>2022-03-16 15:47:04 UTC</pubDate>
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         <title>Bùi Hồng Phương Anh</title>
         <author>anh056762</author>
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         <description><![CDATA[<div>a) Xét hình bình hành ABCD, có:<br>+ góc ADC=góc ABC (t/c)<br>Có góc ABC+ góc ABM=180 độ (2 góc kề bù)<br>=&gt; góc ABM=180-ABC<br>Có góc ADN+góc ADC=180 độ (2 góc kề bù)<br>=&gt; góc ADN=180-ADC<br>Mà góc ABC=góc ADC (cmt)<br>=&gt; góc ABM= góc ADN<br>Xét tam giác ABM và tam giác ADN, có:<br>+ góc ABM= góc ADN (cmt)<br>+ góc N= góc M<br>=&gt; Tam giác ABM đồng dạng tam giác ADN (g.g)</div>]]></description>
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