化简1/2!+2/3!+3/4!……+n-1/n!
(1/(n^2 n 1 ) 2/(n^2 n 2) 3/(n^2 n 3) ……n/(n^2 n n)) 当N越于无穷大
用数学归纳法证明:1×2×3+2×3×4+…+n×(n+1)×(n+2)=n(n+1)(n+2)(n+3)4(n∈N
lim(1/n^2+4/n^2+7/n^2+…+3n-1/n^2)
化简:1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4)
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
化简:4n+3×4n-1+32×4n-2+…+3n-1×4+3n.
化简(n+1)(n+2)(n+3)
如果,n是大于2的整数,计算1/(n-1)(n-2)+1/(n-2)(n-3)+1/(n-3)(n-4)+……+1/(n
求极限Xn=n/(n^2+1)+n/(n^2+2)+n/(n^2+3)+……+n/(n^2+n),
证明1/(n+1)+1/(n+2)+1/(n+3)+……+1/(n+n)
VB编程n!+(n+1)!+(n+2)!+(n+3)!+……+(n+m)!