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Re:有问题吧！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。。 Followed by: Post your reply here: |
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