S=1²+2²+……+n²

问题描述:

S=1²+2²+……+n²

S=1²+2²+……+n²=n(n+1)(2n+1)/6

打字不易,望采纳

S=1²+2²+……+n²=n(n+1)(2n+1)/6
打字不易,