求极限：lim(n→∞) 3n^2+2n+1/-3n^2+2n

求极限lim [ 2^(n+1)+3^(n+1)]/2^n+3^n (n→∞) 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(-2)^n+3^n/(-2)^[n+1]+3^[n+1] (x→∞) 求极限lim(n→∞)(3n^2-n+1)/(2+n^2)? 求极限：lim(n→∞)[（3n+1 ）/（3n+2）]^(n+1) lim（n→∞) （(2n!/n!*n)^1/n的极限用定积分求 求极限 lim(n->无穷)[(3n^2-2)/(3n^2+4)]^[n(n+1)] 求极限n~∞,lim(n+1)/2n lim π^n/2^n+3^n.求极限 lim π^n/(2^n+3^n).求极限 一道极限题,lim[n^2(2n+1)]/(n^3+n+4)n->∞