设数列{an}的前n项和为Sn,若对任意的正整数n都有Sn=3an-5n(1)求数列{an}的首项,(2)求证数列{(an)+5}是等比数列,并求数列{an}的通项公式,(3)若数列{bn}满足bn=[(5n)+10]/(an)+5,且Tn=b
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![设数列{an}的前n项和为Sn,若对任意的正整数n都有Sn=3an-5n(1)求数列{an}的首项,(2)求证数列{(an)+5}是等比数列,并求数列{an}的通项公式,(3)若数列{bn}满足bn=[(5n)+10]/(an)+5,且Tn=b](/uploads/image/z/6997216-40-6.jpg?t=%E8%AE%BE%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E8%8B%A5%E5%AF%B9%E4%BB%BB%E6%84%8F%E7%9A%84%E6%AD%A3%E6%95%B4%E6%95%B0n%E9%83%BD%E6%9C%89Sn%3D3an-5n%EF%BC%881%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E9%A6%96%E9%A1%B9%2C%EF%BC%882%EF%BC%89%E6%B1%82%E8%AF%81%E6%95%B0%E5%88%97%EF%BD%9B%28an%29%2B5%EF%BD%9D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E5%B9%B6%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%2C%EF%BC%883%EF%BC%89%E8%8B%A5%E6%95%B0%E5%88%97%EF%BD%9Bbn%EF%BD%9D%E6%BB%A1%E8%B6%B3bn%3D%5B%285n%29%2B10%5D%2F%28an%29%2B5%2C%E4%B8%94Tn%3Db)
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