数列an中,a1=3,an+an-1+2n-1=0(1)证明:数列an是等比数列,并求an通项公式;(2)求数列an的前n项和Sn数列an中,a1=3,an+an-1+2n-1=0(1)证明:数列an+n是等比数列,并求an通项公式;(2)求数列an的前n项和Sn
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![数列an中,a1=3,an+an-1+2n-1=0(1)证明:数列an是等比数列,并求an通项公式;(2)求数列an的前n项和Sn数列an中,a1=3,an+an-1+2n-1=0(1)证明:数列an+n是等比数列,并求an通项公式;(2)求数列an的前n项和Sn](/uploads/image/z/1770513-33-3.jpg?t=%E6%95%B0%E5%88%97an%E4%B8%AD%2Ca1%3D3%2Can%2Ban-1%2B2n-1%3D0%281%29%E8%AF%81%E6%98%8E%EF%BC%9A%E6%95%B0%E5%88%97an%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E5%B9%B6%E6%B1%82an%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%EF%BC%9B%EF%BC%882%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%E6%95%B0%E5%88%97an%E4%B8%AD%2Ca1%3D3%2Can%2Ban-1%2B2n-1%3D0%281%29%E8%AF%81%E6%98%8E%EF%BC%9A%E6%95%B0%E5%88%97an%2Bn%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BC%8C%E5%B9%B6%E6%B1%82an%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%EF%BC%9B%EF%BC%882%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn)
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