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就是分段统计吧

Posted by frkstyc at 2005-07-25 17:17:54 on Problem 1019
In Reply To:Re:公式?where??? Posted by:Essence_me at 2005-07-25 17:16:53
> 刚才弄错了,那个公式是错的,但是我还是想不到做这道题目的办法,能否提示一下?

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