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: 于 2010-05-02 14:25:56 [旧帖] [给我悄悄话] 本文已被阅读：次

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