设数列{An}的前项n和为Sn,若对于任意的正整数n都有Sn=2an-3n.设bn=an+3 (1)求证:数列{bn}是等比列.(1)求证:数列{bn}是等比列.(2)求出{An}的通项公式.(3)求数列{NAn}的前n项和.我想知道这题不是bn+1/bn=2.为
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![设数列{An}的前项n和为Sn,若对于任意的正整数n都有Sn=2an-3n.设bn=an+3 (1)求证:数列{bn}是等比列.(1)求证:数列{bn}是等比列.(2)求出{An}的通项公式.(3)求数列{NAn}的前n项和.我想知道这题不是bn+1/bn=2.为](/uploads/image/z/2682245-29-5.jpg?t=%E8%AE%BE%E6%95%B0%E5%88%97%7BAn%7D%E7%9A%84%E5%89%8D%E9%A1%B9n%E5%92%8C%E4%B8%BASn%2C%E8%8B%A5%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8F%E7%9A%84%E6%AD%A3%E6%95%B4%E6%95%B0n%E9%83%BD%E6%9C%89Sn%3D2an-3n.%E8%AE%BEbn%3Dan%2B3+%281%29%E6%B1%82%E8%AF%81%3A%E6%95%B0%E5%88%97%7Bbn%7D%E6%98%AF%E7%AD%89%E6%AF%94%E5%88%97.%281%29%E6%B1%82%E8%AF%81%3A%E6%95%B0%E5%88%97%7Bbn%7D%E6%98%AF%E7%AD%89%E6%AF%94%E5%88%97.%282%29%E6%B1%82%E5%87%BA%7BAn%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F.%283%29%E6%B1%82%E6%95%B0%E5%88%97%7BNAn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C.%E6%88%91%E6%83%B3%E7%9F%A5%E9%81%93%E8%BF%99%E9%A2%98%E4%B8%8D%E6%98%AFbn%2B1%2Fbn%3D2.%E4%B8%BA)
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