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Orz... 不知道无穷级数是什么,压力好大T_T

Posted by xuhaoran510 at 2011-12-20 21:15:35 on Problem 3028
In Reply To:套个无穷级数的公式,就是除以(1-p),就可以了 Posted by:Seen at 2011-12-20 18:35:10
rt

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