在等差数列{an}和等比数列{bn}中,a1=1,b1=2,bn>0(n∈N*),且b1,a2,b2成等差数列,a2,b2,a3+2成等比数列.(Ⅰ)求数列{an}、{bn}的通项公式;(Ⅱ)设cn=abn,数列{cn}的前n和为Sn
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![在等差数列{an}和等比数列{bn}中,a1=1,b1=2,bn>0(n∈N*),且b1,a2,b2成等差数列,a2,b2,a3+2成等比数列.(Ⅰ)求数列{an}、{bn}的通项公式;(Ⅱ)设cn=abn,数列{cn}的前n和为Sn](/uploads/image/z/14323210-34-0.jpg?t=%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E5%92%8C%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%7Bbn%7D%E4%B8%AD%2Ca1%3D1%2Cb1%3D2%2Cbn%EF%BC%9E0%EF%BC%88n%E2%88%88N%2A%EF%BC%89%2C%E4%B8%94b1%2Ca2%2Cb2%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2Ca2%2Cb2%2Ca3%2B2%E6%88%90%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BC%8E%EF%BC%88%E2%85%A0%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D%E3%80%81%7Bbn%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%EF%BC%9B%EF%BC%88%E2%85%A1%EF%BC%89%E8%AE%BEcn%3Dabn%2C%E6%95%B0%E5%88%97%7Bcn%7D%E7%9A%84%E5%89%8Dn%E5%92%8C%E4%B8%BASn)
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