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请教一下。。。

Posted by misshanli at 2009-09-09 21:01:44 on Problem 1183
In Reply To:我的推导过程 Posted by:stephtan at 2008-09-04 21:39:16 
>恕我愚昧。。为什么m从a开始呢。。且为什么这样b+c最小呢。。。
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