1+20+300+4000+50000+……+1/2+1/3+……+1/n的敛散性
(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
证明不等式:(1/n)的n次方+(2/n)的n次方+……+(n/n)的n次方
n是自然数,0≤n≤101,则| n-1|+|n-2|+|n-3|+…+|n-100|的最小值,
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
计算排列的逆序数:n(n-1)(n-2)(n-3)……21
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)!
lim(1/n^2+4/n^2+7/n^2+…+3n-1/n^2)
求极限Xn=n/(n^2+1)+n/(n^2+2)+n/(n^2+3)+……+n/(n^2+n),
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
(n-1)(n-2)(n-3)(n-4)……(n-m+1)(n-m)n大于m 的计算公式
计算:C(1,n)+2C(2,n)+3C(3,n) + … + nC(n,n)