lim n->0 (1+3n/1)^3n = ?

若a>0,则lim{(3^n-a^n)/[3^(n+1)+a^(n+1)]}=? lim[(n+3)/(n+1))]^(n-2) 【n无穷大】 lim n->无穷大(2^n-1)/(3^n+1) lim[(n-1)/(n+1)]^3n的值为 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 求极限,lim(x->0) (1-2sinx)^(3/x)lim(n->+∞) (n!-4^n) / (6+ln(n)+ 高数 设U(n) 不等于 0 (n=1,2,3,,) 且 (n→无穷)lim n/U(n) =1,则级数（n=1)∑[( lim(n→∞)[1/(3n+1)+1/(3n+2)+~1/(3n+n)] 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)]