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有道理....数学啊....我怎么说呢.....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 Followed by: Post your reply here: |
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