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证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
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[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
2^n/n*(n+1)
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
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