答:极限等于e的平方的是:①n→∞时lim(1+1/n)^2n=lim[(1+1/n)^n]^2=e^2,②n→0时,lim(1+n)^2/n=|im[(1+n)^1/n]^2=e2,③n→∞时,Ⅰim(1+1/√n)^n=lim[(1+1/√n)^√n]^2=e^2。