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	Commentaires sur : Problème ouvert : des chiffres et des lettres	</title>
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	<description>L&#039;enseignement, des maths et le &#34;Libre&#34;</description>
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		<title>
		Par : Dr. Goulu		</title>
		<link>https://mathix.org/linux/archives/9021#comment-1597</link>

		<dc:creator><![CDATA[Dr. Goulu]]></dc:creator>
		<pubDate>Thu, 18 Aug 2016 12:38:26 +0000</pubDate>
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					<description><![CDATA[Effectivement:
(10*n+5)^2 = 100*n^2 + 25 + 2*50*n = 100*n(n+1)+25

Joli :-)]]></description>
			<content:encoded><![CDATA[<p>Effectivement:<br />
(10*n+5)^2 = 100*n^2 + 25 + 2*50*n = 100*n(n+1)+25</p>
<p>Joli 🙂</p>
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