1/n(n+1)+1/(n+1)(n+2)+1/(n+2)(n+3)+……+1/(n+2005)(n+2006)求出当n=1时,该代数式的值
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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)!
n^(n+1/n)/(n+1/n)^n
(n+1)^n-(n-1)^n=?
化简：(n+1)!/n!-n!/(n-1)!
(n-1)*n!+(n-1)!*n
推导 n*n!=(n+1)!-n!
[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
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化简n分之n-1+n分之n-2+n分之n-3+.+n分之1
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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?
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