=________.

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问题 =________.

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答案1

解析 由n/(n2+n)≤1/(n2+1)+1/(n2+2)+…+1/(n2+n)≤n/(n2+n)得
n/(n2+n)≤n[n/(n2+n)≤1/(n2+1)+1/(n2+2)+…+1/(n2+n)]≤n/(n2+1)
=1得原式=1.
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