lim[1^n+2^n+3^n]^(1/n)等于多少

lim(1-2/n)的N次方等于多少 lim[(n+3)/(n+1))]^(n-2) 【n无穷大】 n(n+1)(n+2)等于多少? lim n->无穷大(2^n-1)/(3^n+1) lim根号n^2+n+1/3n-2 lim(3^2n+5^n)/(1+9^n) 求lim n→∞ (1+2/n)^n+3 lim(n→∞)[1/(3n+1)+1/(3n+2)+~1/(3n+n)] lim n趋于无穷大(1/n^2+3/n^2+.+2n-1/n^2 lim(1/n^2+4/n^2+7/n^2+…+3n-1/n^2) 求极限lim [ 2^(n+1)+3^(n+1)]/2^n+3^n (n→∞) 求lim(n+1)(n+2)(n+3)/(n^4+n^2+1)