Great.a lot Math Phd.can't do it.

来源: jinjing 于 2009-12-12 21:59:37 [] [旧帖] [给我悄悄话] 阅读数 : (6 bytes)
回答: 回复：I'm wrong,coz carelessness. 由 jinjing 于 2009-12-11 15:46:53

Great.

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