求极限 lim(3n^2+n)/(2n^2-1)

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(x→∞)（1/n+2/n+3/n..+n/n） lim n →∞ (1^n+3^n+2^n)^1/n,求数列极限 求极限n~∞,lim(n+1)/2n 求极限Lim（(n-x)/(n+2))^(n+1) lim (1+2/n)^n+4 n-->无穷大 求极限 求极限lim(n→∞)(3n^2-n+1)/(2+n^2)? 求极限lim(-2)^n+3^n/(-2)^[n+1]+3^[n+1] (x→∞) 求极限lim (3^n+1-2^n+1)/(3^n+2^n) 求lim(n->无穷)(3n+5)/(n^2+n+4)^1/2的极限 求极限：lim((2n∧2-3n+1)/n+1)×sin n趋于无穷 求极限 lim (cosnπ/2)/n .求极限lim(2n^3+5)/(n^3-3n^2) lim下面是n到无限大 lim π^n/2^n+3^n.求极限lim n趋向于正无穷大.具体解算, lim π^n/(2^n+3^n).求极限lim n趋向于正无穷大.具体解算, lim(n→∞) 1/(n+1)-2/(n+1)+3/(n+1)-4/(n+1)+...+[(2n-1)/(n+1)]-[(2n)/(n-1)]求极限 求极限lim(n→∞)(1/n²+2/n²+...+n/n²)