设等差数列{an}的前n项和为Sn,且a5+a13=34,S3=9.(1)求数列{an}的通项公式及前n项和公式.(2)设数列{bn}的通项公式为bn=an/(an+t),问是否存在正整数t,使得b1,b2,bm(m≥3,m∈整数)成等差数列,若存在求
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![设等差数列{an}的前n项和为Sn,且a5+a13=34,S3=9.(1)求数列{an}的通项公式及前n项和公式.(2)设数列{bn}的通项公式为bn=an/(an+t),问是否存在正整数t,使得b1,b2,bm(m≥3,m∈整数)成等差数列,若存在求](/uploads/image/z/5430326-14-6.jpg?t=%E8%AE%BE%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E4%B8%94a5%2Ba13%3D34%2CS3%3D9.%EF%BC%881%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%E5%8F%8A%E5%89%8Dn%E9%A1%B9%E5%92%8C%E5%85%AC%E5%BC%8F.%EF%BC%882%EF%BC%89%E8%AE%BE%E6%95%B0%E5%88%97%7Bbn%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%E4%B8%BAbn%3Dan%2F%28an%2Bt%29%2C%E9%97%AE%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E6%AD%A3%E6%95%B4%E6%95%B0t%2C%E4%BD%BF%E5%BE%97b1%2Cb2%2Cbm%28m%E2%89%A53%2Cm%E2%88%88%E6%95%B4%E6%95%B0%EF%BC%89%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E8%8B%A5%E5%AD%98%E5%9C%A8%E6%B1%82)
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