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修正！！！

Posted by Emember at 2008-12-26 14:02:26 on Problem 2000
In Reply To:公式很容易推导啊 Posted by:peterdi at 2008-12-09 14:14:35 
1*1+2*2+3*3+..+n*n=n*(n+1)*(2*n+1)/2
改为：
1*1+2*2+3*3+..+n*n=n*(n+1)*(2*n+1)/6
这是求
∑i^2 的公式。
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