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](/uploads/image/z/19035659-11-9.jpg?t=%E6%95%B0%E5%88%97An%3D1%2Fn%5E2%2CSn%E4%B8%BA%E5%85%B6%E5%89%8Dn%E9%A1%B9%E5%92%8C%2C%E5%BD%93n%E2%89%A52%E6%97%B6%E8%AF%81%E6%98%8E6n%2F%28n%2B1%29%282n%2B1%29%EF%BC%9CSn%EF%BC%9C5%2F3)
n>=2时An=1/n^2
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