2. 考研
  3. 1/2n(n+1)/(n2+n+n)≤1/(n2+n+1)+2/(n2+n+2)+…+n/(n2+n+n)≤1/2n(n+1)/(n2+n+1)， [*]

1/2n(n+1)/(n2+n+n)≤1/(n2+n+1)+2/(n2+n+2)+…+n/(n2+n+n)≤1/2n(n+1)/(n2+n+1)， [*]

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答案1/2n(n+1)/(n2+n+n)≤1/(n2+n+1)+2/(n2+n+2)+…+n/(n2+n+n)≤1/2n(n+1)/(n2+n+1)， [*]
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考研数学三

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