几道高二数列的题1,已知数列a(n)首项为a(1)=2/3 ,a(n+1)=2a(n)/a(n)+1 ,n=1,2,3.(1),证明{1/a(n)-1}是等比数列.(2),求数列{n/a(n)}的前n项和S(n) .2,已知数列{a(n)} ,a(1)=1 ,且a(n)=3a(n-1)-2n+3 ,n=2,3,4.
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![几道高二数列的题1,已知数列a(n)首项为a(1)=2/3 ,a(n+1)=2a(n)/a(n)+1 ,n=1,2,3.(1),证明{1/a(n)-1}是等比数列.(2),求数列{n/a(n)}的前n项和S(n) .2,已知数列{a(n)} ,a(1)=1 ,且a(n)=3a(n-1)-2n+3 ,n=2,3,4.](/uploads/image/z/693432-0-2.jpg?t=%E5%87%A0%E9%81%93%E9%AB%98%E4%BA%8C%E6%95%B0%E5%88%97%E7%9A%84%E9%A2%981%2C%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97a%28n%29%E9%A6%96%E9%A1%B9%E4%B8%BAa%281%29%3D2%2F3+%2Ca%28n%2B1%29%3D2a%28n%29%2Fa%28n%29%2B1+%2Cn%3D1%2C2%2C3.%281%29%2C%E8%AF%81%E6%98%8E%7B1%2Fa%28n%29-1%7D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97.%EF%BC%882%EF%BC%89%2C%E6%B1%82%E6%95%B0%E5%88%97%7Bn%2Fa%28n%29%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CS%EF%BC%88n%EF%BC%89+.2%2C%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ba%EF%BC%88n%EF%BC%89%7D+%2Ca%EF%BC%881%EF%BC%89%3D1+%2C%E4%B8%94a%EF%BC%88n%EF%BC%89%3D3a%EF%BC%88n-1%EF%BC%89-2n%2B3+%2Cn%3D2%2C3%2C4.)
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