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有道理....数学啊....我怎么说呢.....

Posted by palmtenor at 2005-06-06 14:22:22 on Problem 2100
In Reply To: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 Posted by:frkstyc at 2005-06-06 14:19:05


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