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      <title>Дошка by Голодняк Катя</title>
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      <description>Публікуйте що завгодно і де завгодно</description>
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      <pubDate>2025-04-23 14:23:36 UTC</pubDate>
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         <description><![CDATA[<p><br></p><p>EF² = DE^2 + DF² - 2 <em> DE * DF </em>* cos( ∠D )</p><p>EF² = 4² + (2√3) - 2 *<em> 4  2√3 </em> cos(30)</p><p>EF² = 16 + 12 - 16√3* √3/2</p><p>EF² = 28 - 16√3 <em> √3/2 = 28 - 16 </em>* 3/2 = 28 - 24 = 4</p><p>EF = √4 = 2СМ</p>]]></description>
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         <pubDate>2025-04-23 15:27:14 UTC</pubDate>
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