1n/(n2+n)≤1/(n2+1)+1/(n2+2)+…n/(n2+1)得n2/(n2+n)≤n/(n2+1)+n/(n2-2)+…n/(n2-n)≤n2/(n2+1),

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解析 n/(n2+n)≤1/(n2+1)+1/(n2+2)+…n/(n2+1)得n2/(n2+n)≤n/(n2+1)+n/(n2-2)+…n/(n2-n)≤n2/(n2+1),
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