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ft，用一点数学！1^2+...+n^2=n(n+1)(2n+1)/6=2n(2n+1)(2n+2)/24，直接开立方就可以估算2n了In Reply To:拿几何画板画个函数图像试试~ Posted by:palmtenor at 2005-06-06 14:17:03 Followed by:
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