求lim(n+1)(n+2)(n+3)/(n^4+n^2+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) 求lim n→∞ (1+2/n)^n+3 lim[(n+3)/(n+1))]^(n-2) 【n无穷大】 求极限lim [ 2^(n+1)+3^(n+1)]/2^n+3^n (n→∞) lim n →∞ (1^n+3^n+2^n)^1/n,求数列极限 求极限lim(x→∞)（1/n+2/n+3/n..+n/n） lim(1/n^2+4/n^2+7/n^2+…+3n-1/n^2) 一道极限题,lim[n^2(2n+1)]/(n^3+n+4)n->∞ lim 9^n+4^n+2/5^n-3^2n-1 n趋于无穷大时 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[n/(n*n+1*1)+n/(n*n+2*2)+...+n/(n*n+n*n)],当x趋向无穷大时,怎么求极限,