[1-2+3-4+.+(2n-1)-2n]/(n-1)的极限

(2^n+(-3)^n)/(2^(n+1)+(-3)^(n+1)) n趋近无穷大的极限 [(2n+3n)/( 2n+1+3n+1)]的极限,n趋于无穷 求(1^n+2^n+3^n)^1/n,n趋于无穷大的极限 lim(n趋于无穷)[n(n+1)/2]/n方+3n的极限是多少? 求极限 lim(n->无穷)[(3n^2-2)/(3n^2+4)]^[n(n+1)] 一道极限题,lim[n^2(2n+1)]/(n^3+n+4)n->∞ 求n/2(n+1)的极限 lim n趋近无穷 3n^3+n^2-3/4n^3+2n+1的极限 lim((5^n-4^(n-1))/((5^(n+1)+3^(n+2)) n→∞时的极限是多少? 用夹逼定理求极限运用夹逼定理求下列序列的极限(6n^4+n-2)^(1/n)(lg3n)^(1/n)[2/(3n^2-n 用级数求(n/2n+1)^n的极限 lim[1/(n+1)+1/(n+2)+1/(n+3)+、、、1/(n+n)]当n趋于无穷大时的极限?