求3[2^0+2^1+2^2+……+2^(n-2)]的值
若n²+3n=1,求n(n+1)(n+2)+1的值.
求极限 lim n[1/(n^2+1)+1/(n^2+2^2)+……+1/(n^n+n^n)] (n趋向于无穷大,n^n
1\n(n+3)+1\(n+3)(n+6)+1\(n+6)(n+9)=1\2 n+18 n为正整数,求n的值
求极限Xn=n/(n^2+1)+n/(n^2+2)+n/(n^2+3)+……+n/(n^2+n),
求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n
lim((n^2+2n-1)/(2n^2-n+3))的值 求详解
求x趋近于0时候的极限 [(n!)^(-1) * n^(-n) * (2n)!]^(1/n)
若n为正整数,求(3^n*2^n*5^n)/(-30)^n的值
求(1^n+2^n+3^n)^1/n,n趋于无穷大的极限
当n趋向无穷大时,求 ((1^2+2^2+…n^2)/(n+1)^2-n/3)的极限?
求极限lim(x→∞)(1/n+2/n+3/n..+n/n)
化简:当n=1/2时,求(3n-1)(n+1)+(2n-1)(n-1)的值.