已知等差数列{an}的前n项和sn,a2+a7=-23,s10=-145(1)求数列{an}的通项公式(2)设数列{bn/an}是首项为1,公比为c的等比数列,求数列{bn}的前n项和Tn
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![已知等差数列{an}的前n项和sn,a2+a7=-23,s10=-145(1)求数列{an}的通项公式(2)设数列{bn/an}是首项为1,公比为c的等比数列,求数列{bn}的前n项和Tn](/uploads/image/z/1132285-13-5.jpg?t=%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8Csn%2Ca2%2Ba7%3D-23%2Cs10%3D-145%281%29%E6%B1%82%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%282%29%E8%AE%BE%E6%95%B0%E5%88%97%7Bbn%2Fan%7D%E6%98%AF%E9%A6%96%E9%A1%B9%E4%B8%BA1%2C%E5%85%AC%E6%AF%94%E4%B8%BAc%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E6%B1%82%E6%95%B0%E5%88%97%7Bbn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CTn)
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