已知lnx ≤ x-1 求证ln(2^2)/2^2+ln(3^2)/3^2+……ln(n^2)/n^2<(2n^2-n+
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已知lnx ≤ x-1 求证ln(2^2)/2^2+ln(3^2)/3^2+……ln(n^2)/n^2<(2n^2-n+1)/2(n+1)
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