lim(3^2n+5^n)/(1+9^n)=?

lim(3^2n+5^n)/(1+9^n)=? lim(3^2n+5^n)/(1+9^n)3^2n or 5^n lim(1/n+2/n+3/n+4/n+5/n+……+n/n)=lim(1/n)+lim(2/n)+……+lim(n/n)成立吗?（n趋近于无穷大）为什么不成立? lim(n+3)(4-n)/(n-1)(3-2n) lim(n^3+n)/(n^4-3n^2+1) lim[(n+3)/(n+1))]^(n-2) 【n无穷大】 lim(2^n+3^n)^1 (n趋向无穷) lim (n!+(n-1)!+(n-2)!+(N-3)!+⋯..+2!+1)/n!其中n→∞ 用数列极限证明lim(n→∞)(n^-2)/(n^+n+1)=1中证明如下:lim(n→∞)3n+1/5n-4 lim(n->无穷)[(1+3+5+.(2n+1)]/n^2]^(3-2n) lim((2n+1)^5(n+10)^3)/((n^2-2n-3)^4)=32 lim(n-无穷)=3n^2/5n^2+2n-1, 求lim(n->无穷)(3n+5)/(n^2+n+4)^1/2的极限 lim(n->∞) n+1/n^2 - 9 lim n->无穷大(2^n-1)/(3^n+1) lim根号n^2+n+1/3n-2 lim根号n^2+n+1/3n-2=? 求lim n→∞ (1+2/n)^n+3