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高人啊!数学真好,这样的题做了好几道了,但就是自己不会推,哎,高中的时候数学没学好啊

Posted by zhulin10541 at 2009-03-11 19:48:34 on Problem 1183
In Reply To:我的推导过程 Posted by:stephtan at 2008-09-04 21:39:16


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