Lim((1²;+2²;+……+n²;)/n³;)n→∞=

Lim((1²;+2²;+……+n²;)/n³;)n→∞=

1²;+2²;+……+n²;=n(n+1)(2n+1)/6
所以原式=limn(n+1)(2n+1)/6n^3
=lim(1+1/n)(2+1/n)/6
=1*2/6
=1/3