证1+1/2³+1/3³+...+1/n³≤3/2-1/2n²(n∈R)
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证1+1/2³+1/3³+...+1/n³≤3/2-1/2n²(n∈R)
证1+1/2³+1/3³+...+1/n³≤3/2-1/2n²(n∈R)
证1+1/2³+1/3³+...+1/n³≤3/2-1/2n²(n∈R)