(2^n*n!)/n^n在n趋向无穷时等于多少?

证明n趋向无穷时,5n^2/(7n-n^2)的极限等于-5 当n趋向于无穷,n的阶乘除以n的n次方等于多少 求n趋向无穷时 [(1+1/n)(1+2/n)...(1+n/n)]^1/n 的极限? lim{(1/n+1)+(1/n+2)+.+(1/2n-1)+(1/2n)}在n趋向无穷大时等于多少谢谢了,大神帮忙啊 求极限 n趋向无穷 2^n+1 + 3^n+1/2^n+3^n 数学极限题.当n趋于无穷时,{Sin[兀/(2^n)]}^(1/n)等于多少, n趋向正无穷时,[(2n-1)!/(2n!)]的极限是多少? 当n趋向无穷时,２的n次方除３的n次方的极限 lim(√(n2+2n)-n) 当n趋向无穷时 n^2/3^n当n趋向于无穷时求极限 n趋于无穷时,n+1的阶乘等于多少? n(n+1)(n+2)等于多少?