.求极限lim(2n^3+5)/(n^3-3n^2) lim下面是n到无限大

求极限lim 2/(3^n-1) 求lim(n->无穷)(3n+5)/(n^2+n+4)^1/2的极限 .求极限lim(2n^3+5)/(n^3-3n^2) lim下面是n到无限大 求极限lim[(3n-5)/(3n+1)]^(2n-7) 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lim n趋于无穷大((n+1)(n+2)(n+3)) / 5n的三次方 的极限 求极限lim(n+1/n+3)^n如题 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) 求极限lim(n→∞)(3n^2-n+1)/(2+n^2)? 求极限：lim((2n∧2-3n+1)/n+1)×sin n趋于无穷 1.7求极限lim(x→∞) [(n+1)(n+2)(n+3)]/5 n^31.7求极限lim(x→∞) [(n+1)(n+2)(n+3)]/5 n^3 lim(3n^2-2n+6)/(5n^2+7n+9)求数列的极限 求极限：lim(1+2+3+...+n)/(1+3+5+...+2n-1)= 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,