数列An=1/n^2,Sn为其前n项和,当n≥2时证明6n/(n+1)(2n+1)<Sn<5/3

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数列An=1/n^2,Sn为其前n项和,当n≥2时证明6n/(n+1)(2n+1)<Sn<5/3

数列An=1/n^2,Sn为其前n项和,当n≥2时证明6n/(n+1)(2n+1)<Sn<5/3
数列An=1/n^2,Sn为其前n项和,当n≥2时证明6n/(n+1)(2n+1)<Sn<5/3

数列An=1/n^2,Sn为其前n项和,当n≥2时证明6n/(n+1)(2n+1)<Sn<5/3
n>=2时An=1/n^2