已知an是公比大于1的等比数列设an是公比大于1的等比数列,Sn为数列an的前n项和,已知S3=7,且a1+3,3a2,a3+4都称等差数列(1)求数列an的通项(2)令bn=Ina3n+1,n=1,2...求数列bn的前n项和T
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![已知an是公比大于1的等比数列设an是公比大于1的等比数列,Sn为数列an的前n项和,已知S3=7,且a1+3,3a2,a3+4都称等差数列(1)求数列an的通项(2)令bn=Ina3n+1,n=1,2...求数列bn的前n项和T](/uploads/image/z/12636459-27-9.jpg?t=%E5%B7%B2%E7%9F%A5an%E6%98%AF%E5%85%AC%E6%AF%94%E5%A4%A7%E4%BA%8E1%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E8%AE%BEan%E6%98%AF%E5%85%AC%E6%AF%94%E5%A4%A7%E4%BA%8E1%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2CSn%E4%B8%BA%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2C%E5%B7%B2%E7%9F%A5S3%3D7%2C%E4%B8%94a1%2B3%2C3a2%2Ca3%2B4%E9%83%BD%E7%A7%B0%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BC%881%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97an%E7%9A%84%E9%80%9A%E9%A1%B9%EF%BC%882%EF%BC%89%E4%BB%A4bn%3DIna3n%2B1%2Cn%3D1%2C2...%E6%B1%82%E6%95%B0%E5%88%97bn%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CT)
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