已知等差数列{an}是首项a1>1,公比q>0的等比数列,设bn=log2(an)(n属于N+)且b1+b3+b5=6,b1*b3*b5=0(1)求{an}的通项公式;(2)设{bn}的前项n和为Sn,当S1/1+S2/2+...+Sn/n最大时,求n的值
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![已知等差数列{an}是首项a1>1,公比q>0的等比数列,设bn=log2(an)(n属于N+)且b1+b3+b5=6,b1*b3*b5=0(1)求{an}的通项公式;(2)设{bn}的前项n和为Sn,当S1/1+S2/2+...+Sn/n最大时,求n的值](/uploads/image/z/6149783-47-3.jpg?t=%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E6%98%AF%E9%A6%96%E9%A1%B9a1%EF%BC%9E1%2C%E5%85%AC%E6%AF%94q%EF%BC%9E0%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E8%AE%BEbn%3Dlog2%28an%29%28n%E5%B1%9E%E4%BA%8EN%2B%29%E4%B8%94b1%2Bb3%2Bb5%3D6%2Cb1%2Ab3%2Ab5%3D0%EF%BC%881%EF%BC%89%E6%B1%82%7Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%EF%BC%9B%EF%BC%882%EF%BC%89%E8%AE%BE%7Bbn%7D%E7%9A%84%E5%89%8D%E9%A1%B9n%E5%92%8C%E4%B8%BASn%2C%E5%BD%93S1%2F1%2BS2%2F2%2B...%2BSn%2Fn%E6%9C%80%E5%A4%A7%E6%97%B6%2C%E6%B1%82n%E7%9A%84%E5%80%BC)
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