lim(1/2+1/2^2...+1/2^n)/(1/3+1/3^2...1/3^n) 求极限

求极限lim 2/(3^n-1) 求极限lim [ 2^(n+1)+3^(n+1)]/2^n+3^n (n→∞) 求极限 lim(n->无穷)[(3n^2-2)/(3n^2+4)]^[n(n+1)] lim n →∞ (1^n+3^n+2^n)^1/n,求数列极限 求极限lim(x→∞)（1/n+2/n+3/n..+n/n） 求极限lim (3^n+1-2^n+1)/(3^n+2^n) 求极限lim(-2)^n+3^n/(-2)^[n+1]+3^[n+1] (x→∞) 求极限：lim(n→∞)[（3n+1 ）/（3n+2）]^(n+1) 求极限：lim((2n∧2-3n+1)/n+1)×sin n趋于无穷 求极限lim(1+2^n+3^n)^1/n.n-->无穷. 求极限lim(n→∞)(3n^2-n+1)/(2+n^2)? 求极限,lim(x->0) (1-2sinx)^(3/x)lim(n->+∞) (n!-4^n) / (6+ln(n)+