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<p>#1 一道证明题<br /><small>平面上N（N&gt;=3）个点，N个点不全在一条直线上<br />
证明：必能找到一条直线，只经过其中的两个点。</small><br />
3/2 21:13<br />
月映长河<br /></p>
<p>#2 <br /><small>这个似乎只能用反证法了</small><br />
3/3 09:18<br />
无敌马孟起<br /></p>
<p>#3 <br /><small>题目倒是简单，可这答案，中学知识能吗</small><br />
3/3 13:46<br />
KYOKO<br /></p>
<p>#4 <br /><small>这道题曾是某个人问欧拉的，欧 ..</small><br />
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<p>#4 <a href="index.php?action=thread&amp;tid=205352&amp;start=3&amp;offset=44&amp;sid=RH0sqn">&gt;&gt;下页</a><br />
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<br />主题:<a href="index.php?action=thread&amp;tid=205352&amp;sid=RH0sqn">一道证明题</a>
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