地上有无数相距为一的//线。随机在地上扔一棍长为A棍，为求 压线的几率

来源: jinjing 于 2010-05-02 14:25:56 [] [旧帖] [给我悄悄话] 阅读数 : (59 bytes)

My friend,sometimes,You are careless than I did.I'm right?

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