大师作文网1/12+1/32+1/52+1/72+……+1/(2n-1)2
(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
2^n/n*(n+1)
证明不等式：(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
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
证明不等式：(1/n)的n次方+(2/n)的n次方+……+(n/n)的n次方
证明1/(n+1)+1/(n+2)+1/(n+3)+……+1/(n+n)
数学不等式证明题n=1,2,……证明：(1/n)^n+(1/2)^n+……+(n/n)^n第二个是(2/n)^n
lim(1/n^2+4/n^2+7/n^2+…+3n-1/n^2)
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
求极限Xn=n/(n^2+1)+n/(n^2+2)+n/(n^2+3)+……+n/(n^2+n),
VB编程n!+(n+1)!+(n+2)!+(n+3)!+……+(n+m)!
组合：C（n,0）+C(n,1)+……+C(n,n)=n^2