已知{an}是公比为q的等比数列,且a1,a3,a2成等差数列,(1)求q值..(2)设bn是以2为首项,q为公差的等差数列,起前n想和为sn,当n≥2时,比较sn与bn的大小.说明理由,
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![已知{an}是公比为q的等比数列,且a1,a3,a2成等差数列,(1)求q值..(2)设bn是以2为首项,q为公差的等差数列,起前n想和为sn,当n≥2时,比较sn与bn的大小.说明理由,](/uploads/image/z/1926579-3-9.jpg?t=%E5%B7%B2%E7%9F%A5%7Ban%7D%E6%98%AF%E5%85%AC%E6%AF%94%E4%B8%BAq%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E4%B8%94a1%2Ca3%2Ca2%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%281%29%E6%B1%82q%E5%80%BC..%282%29%E8%AE%BEbn%E6%98%AF%E4%BB%A52%E4%B8%BA%E9%A6%96%E9%A1%B9%2Cq%E4%B8%BA%E5%85%AC%E5%B7%AE%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E8%B5%B7%E5%89%8Dn%E6%83%B3%E5%92%8C%E4%B8%BAsn%2C%E5%BD%93n%E2%89%A52%E6%97%B6%2C%E6%AF%94%E8%BE%83sn%E4%B8%8Ebn%E7%9A%84%E5%A4%A7%E5%B0%8F.%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1%2C)
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