S=1²+2²+……+n²
问题描述:
S=1²+2²+……+n²
答
S=1²+2²+……+n²=n(n+1)(2n+1)/6
打字不易,
S=1²+2²+……+n²
S=1²+2²+……+n²=n(n+1)(2n+1)/6
打字不易,