lim（n→∞）(3n^3-2n+1)/n^3+n

lim（n→∞）(3n^3-2n+1)/n^3+n^2

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求1.lim(3n-(3n^2+2n)/(n-1)) 2.lim(8+1/(n+1)) 3.lim根号n(根号(n+1)
lim(1/n2+2/n2+3/n2+……n/n2)为什么不等于lim1/n2 +lim2/n2 +lim3/n2……+
一.lim(2/3)^n=?二.lim(3^n+1)/[3^（n+1)+2^n]=?
求下列极限：（1）lim 3n^2-2n+1/8-n^3 n→∞ (2)lim 1+2+3+…+n/n^2 n→∞
lim (1/n^3+2^2/n^3+3^2/n^3+……n^2/n^3)=?
lim2^n-3^n/2^n+1+3^n+1
lim n→∞ (n+2)^3+(2n+3)^3/(n-1)(2n-1)(3n-2) 是多少?
lim n→∞ (n+2)^3+(2n+3)^3/(n-1)(2n-1)(3n-2) 是多少?
lim(n→∞)√（3^n）/(n*2^n）和lim(n→∞)√(n^2)/(3^n)求极限,
lim n趋向无穷大 (2^3n-3^2n-1)/(2^3n+3^2n)=?