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original poster: 转化与化归

[几何] 一道解析几何题

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isee posted 2014-6-2 23:09

这题用来体会无穷远点的魅力，真是无限好啊。

其实很麻烦，平行还是仿射变换得相似表直接。

不过，圆里要证$CD$过$P$应该和上面后半部分是一样的吧。

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isee posted 2014-6-2 23:11

19楼最后完成的证明与15楼16楼相去甚远

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