lim[(2n^2+5n-1)/(3n^2-2n^2)+(3+5n)/(3n-1)]n趋于无穷大

lim(3^2n+5^n)/(1+9^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(3^2n+5^n)/(1+9^n)3^2n or 5^n 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根号n^2+n+1/3n-2 lim根号n^2+n+1/3n-2=? lim n->无穷大(2^n-1)/(3^n+1) 求lim n→∞ (1+2/n)^n+3 lim(n→∞)[1-(2n/n+3)] lim(n→∞)(2n-1/n+3) lim[(4+7+...+3n+1)/(n^2-n)]= 求1.lim(3n-(3n^2+2n)/(n-1)) 2.lim(8+1/(n+1)) 3.lim根号n(根号(n+1)-根号(n-3)) lim(n->无穷)[(1+3+5+.(2n+1)]/n^2]^(3-2n)