Sn=1+1/2²+1/3²+1/4²+……+1/n²,求证Sn>3/2

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Sn=1+1/2²+1/3²+1/4²+……+1/n²,求证Sn>3/2
Sn=1+1/2²+1/3²+1/4²+……+1/n²,求证Sn>3/2

Sn=1+1/2²+1/3²+1/4²+……+1/n²,求证Sn>3/2
Sn=1+1/2²+1/3²+1/4²+……+1/n²
>1+1/2×3+1/3×4+.+1/n(n+1)
=1+1/2-1/3+1/3-1/4+.+1/n-1/(n+1)
=3/2-1/(n+1)
>3/2