等差数列{an}中,a1=3,前n项和为Sn,等比数列{bn}各项均为正数,b1=1且b2+S2=12,{bn}的公比q=S2/b2求(1)an与bn表达式(2)1/S1+1/S2+...+1/Sn
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![等差数列{an}中,a1=3,前n项和为Sn,等比数列{bn}各项均为正数,b1=1且b2+S2=12,{bn}的公比q=S2/b2求(1)an与bn表达式(2)1/S1+1/S2+...+1/Sn](/uploads/image/z/4315831-7-1.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca1%3D3%2C%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%7Bbn%7D%E5%90%84%E9%A1%B9%E5%9D%87%E4%B8%BA%E6%AD%A3%E6%95%B0%2Cb1%3D1%E4%B8%94b2%2BS2%3D12%2C%7Bbn%7D%E7%9A%84%E5%85%AC%E6%AF%94q%3DS2%2Fb2%E6%B1%82%EF%BC%881%EF%BC%89an%E4%B8%8Ebn%E8%A1%A8%E8%BE%BE%E5%BC%8F%EF%BC%882%EF%BC%891%2FS1%2B1%2FS2%2B...%2B1%2FSn)
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