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[几何] 一道几何题

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king12123 posted 2015-8-24 20:27 |Read mode

QQ图片20150824202426.jpg

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abababa posted 2015-8-25 16:03

回复 1# king12123
以前看网友证过这题

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original poster king12123 posted 2015-8-25 21:32

方法很巧，感谢了。

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其妙 posted 2015-8-25 23:45

幂差法证垂直

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