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[几何] 立体几何中反射路径问题

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realnumber Posted 2016-5-3 18:40 |Read mode

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Author| realnumber Posted 2016-5-3 18:57

Last edited by realnumber 2016-5-3 19:53 QQ截图20160503185704.png

QQ截图20160503185704.png

QQ截图20160503192716-2.png

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Author| realnumber Posted 2016-5-3 19:57

补上去的2次都是按镜面对称完成的.
A2A3过AB中点M,且互相垂直，又MP2=4.5
答案是A

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