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Re:公式的推导

Posted by damacheng009 at 2010-06-18 16:11:44 on Problem 2140
In Reply To:Re:公式的推导 Posted by:Ly86 at 2010-04-25 19:05:40
不错。。用了你的方法0ms通过。。
话说回来你是怎么想出来的啊。。
哎。。我数学垃圾到爆。。

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