已知数列{an}是等差数列,数列{bn}是等比数列,又a1=b1=1,a2b2=2,a3b3=7/4(1)求数列{an}及数列{bn}(2)设cn=anbn,求数列{cn}的前n项和Sn
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![已知数列{an}是等差数列,数列{bn}是等比数列,又a1=b1=1,a2b2=2,a3b3=7/4(1)求数列{an}及数列{bn}(2)设cn=anbn,求数列{cn}的前n项和Sn](/uploads/image/z/1614593-65-3.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E6%95%B0%E5%88%97%7Bbn%7D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E5%8F%88a1%3Db1%3D1%2Ca2b2%3D2%2Ca3b3%3D7%2F4%EF%BC%881%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D%E5%8F%8A%E6%95%B0%E5%88%97%7Bbn%7D%EF%BC%882%EF%BC%89%E8%AE%BEcn%3Danbn%2C%E6%B1%82%E6%95%B0%E5%88%97%7Bcn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn)
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