首页 > 教育 > 作者:YD1662024-04-05 13:06:58
3(1^2 2^2 3^2 … n^2)
=n(n 1)(2n 1)/2
1^2 2^2 3^2 … n^2
=[n×(n 1)×(2n 1)]/6
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