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

來源: jinjing 於 2009-12-12 21:59:37 [] [舊帖] [給我悄悄話] 閱讀數 : (6 bytes)
回答: 回複：I'm wrong,coz carelessness. 由 jinjing 於 2009-12-11 15:46:53

Great.

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