lim(1+4+7+…+(3n-2))/(7n^2-5n),

lim(1/n^2+4/n^2+7/n^2+…+3n-1/n^2) lim(n→∞)3n^2+5n-7/4-n^2的值是 lim 9^n+4^n+2/5^n-3^2n-1 n趋于无穷大时 lim(3^2n+5^n)/(1+9^n) lim[(n+3)/(n+1))]^(n-2) 【n无穷大】 求极限lim[(3n-5)/(3n+1)]^(2n-7) lim 1+4+7+...+(3n-2)/n(n+1)=______ 求极限 lim(n->无穷)[(3n^2-2)/(3n^2+4)]^[n(n+1)] 求lim(n+1)(n+2)(n+3)/(n^4+n^2+1) 一道极限题,lim[n^2(2n+1)]/(n^3+n+4)n->∞ 求极限lim(1/2n+3/4n+……+(2^n-1)/(2^n*n)) lim((5^n-4^(n-1))/((5^(n+1)+3^(n+2)) n→∞时的极限是多少?