极限limn→∞[3/1^2*2^2+5/2^2*3^2+...+2n+1/n^2*(n+1)^2]

问题描述:

极限limn→∞[3/1^2*2^2+5/2^2*3^2+...+2n+1/n^2*(n+1)^2]