(-1)^2n+(-1)^2n+1+(-1)^2n+2 n为正整数
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/26 21:26:57
(-1)^2n+(-1)^2n+1+(-1)^2n+2n为正整数(-1)^2n+(-1)^2n+1+(-1)^2n+2n为正整数(-1)^2n+(-1)^2n+1+(-1)^2n+2n为正整数解2n是
(-1)^2n+(-1)^2n+1+(-1)^2n+2 n为正整数
(-1)^2n+(-1)^2n+1+(-1)^2n+2 n为正整数
(-1)^2n+(-1)^2n+1+(-1)^2n+2 n为正整数
解
2n是偶数,2n+1是奇数,2n+2是偶数
∴偶次幂是正的,奇数次幂是负的
(-1)^2n+(-1)^2n+1+(-1)^2n+2
=1-1+1
=1
2^n/n*(n+1)
证明不等式：(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
(n+2)!/(n+1)!
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
化简n分之n-1+n分之n-2+n分之n-3+.+n分之1
化简n分之n-1+n分之n-2+n分之n-3+.+n分之1
f(x)=e^x-x 求证(1/n)^n+(2/n)^n+...+(n/n)^n
化简(n+1)(n+2)(n+3)
n*【n+1】*【n+2】化简成什么?
2n/（n+1）n!
n(n+1)(n+2)等于多少?
n+(n-1)÷2×n 求化简
n(n+1)(n+2)什么意思
1^n+2^n+...+2013^n
当n为正偶数,求证n/(n-1)+n(n-2)/(n-1)(n-3)+...+n(n-2).2/(n-1)(n-3)...1=n
2n*1/2^n=n/2^(n-1)?
化简[n^2+(n+1)^2]/n(n+1) 化简额