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Re:有问题吧!

Posted by GodMaster at 2012-07-29 12:15:18 on Problem 2140
In Reply To:公式的推导 Posted by:Ly86 at 2010-04-25 19:03:36
如果k是奇数也能满足,因为k+1是偶数,就和0.5消了。。。
我使用等差数列求和公式+验证做的。。

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