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具体数学上有的...

Posted by ArXoR at 2006-08-31 11:11:22 on Problem 2984
In Reply To:Re:那个公式具体是怎么来的,出题者可以解释清楚一点吗? Posted by:butter at 2006-08-31 11:10:16
> 偶顶顶顶顶顶!

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