化简:(-2)^2n-1+2(-2)^2n
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[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
2^n/n*(n+1)
化简(n+1)(n+2)(n+3)
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
化简[n^2+(n+1)^2]/n(n+1) 化简额
(n+2)!/(n+1)!
化简:1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4)
f(x)=e^x-x 求证(1/n)^n+(2/n)^n+...+(n/n)^n
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