等比数列{an},a3=4,s3=7 (1)求an通项公式 (2)若an是正项数列,数列bn是首项公差都为1的等差数列,数列cn满足cn=bnan,求cn的前n项和Tn
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![等比数列{an},a3=4,s3=7 (1)求an通项公式 (2)若an是正项数列,数列bn是首项公差都为1的等差数列,数列cn满足cn=bnan,求cn的前n项和Tn](/uploads/image/z/3968932-4-2.jpg?t=%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%2Ca3%3D4%2Cs3%3D7+%EF%BC%881%EF%BC%89%E6%B1%82an%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F+%EF%BC%882%EF%BC%89%E8%8B%A5an%E6%98%AF%E6%AD%A3%E9%A1%B9%E6%95%B0%E5%88%97%2C%E6%95%B0%E5%88%97bn%E6%98%AF%E9%A6%96%E9%A1%B9%E5%85%AC%E5%B7%AE%E9%83%BD%E4%B8%BA1%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E6%95%B0%E5%88%97cn%E6%BB%A1%E8%B6%B3cn%3Dbnan%2C%E6%B1%82cn%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CTn)
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