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Re:公式(new)

Posted by oipn4e2 at 2008-06-27 20:41:21 on Problem 1701
In Reply To:公式(new) Posted by:0406340341 at 2007-03-31 18:07:08
能不能给解释一下这个公式什么意思啊?
我看得似懂非懂~

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