因为i2/(n3+n2+n+n)≤i2/(n3+n2+n+i)≤i2/(n3+n2+n+1)(i=1,2,…,n), [*]

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答案因为i2/(n3+n2+n+n)≤i2/(n3+n2+n+i)≤i2/(n3+n2+n+1)(i=1,2,…,n), [*]

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