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[几何] 偶看到一题:与椭圆有关的直线恒过定点

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lemondian posted 2019-1-31 13:49 |Read mode
13101.jpg

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kuing posted 2019-1-31 13:55
太显然是极点极线的东西了
设 L 的极点为 J,则过 J 的任一弦 PQ 均满足要求。

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isee posted 2019-1-31 14:48
回复 2# kuing


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original poster lemondian posted 2019-1-31 17:44
回复 2# kuing
能否写个过程?@kuing
还有,如果不用极点极线,如何解决?

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kuing posted 2019-1-31 18:21
回复 4# lemondian

2# 已经是过程,因为那已经是基本性质,你只要愿意去了解极点极线,就不用我再写什么过程。

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