已知等差数列{an}的前n项和为Sn,且a3=5,S15=2251.求数列{an}的通项公式2.设bn=2的an(数列)次方+2n,求数列{bn}的前n项和Tn第二问我打不太明白,所以大家如果会的话教我第一问就可以了!>_
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![已知等差数列{an}的前n项和为Sn,且a3=5,S15=2251.求数列{an}的通项公式2.设bn=2的an(数列)次方+2n,求数列{bn}的前n项和Tn第二问我打不太明白,所以大家如果会的话教我第一问就可以了!>_](/uploads/image/z/2729344-40-4.jpg?t=%E5%B7%B2%E7%9F%A5%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%94a3%3D5%2CS15%3D2251.%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%8F2.%E8%AE%BEbn%3D2%E7%9A%84an%EF%BC%88%E6%95%B0%E5%88%97%EF%BC%89%E6%AC%A1%E6%96%B9%2B2n%2C%E6%B1%82%E6%95%B0%E5%88%97%7Bbn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CTn%E7%AC%AC%E4%BA%8C%E9%97%AE%E6%88%91%E6%89%93%E4%B8%8D%E5%A4%AA%E6%98%8E%E7%99%BD%2C%E6%89%80%E4%BB%A5%E5%A4%A7%E5%AE%B6%E5%A6%82%E6%9E%9C%E4%BC%9A%E7%9A%84%E8%AF%9D%E6%95%99%E6%88%91%E7%AC%AC%E4%B8%80%E9%97%AE%E5%B0%B1%E5%8F%AF%E4%BB%A5%E4%BA%86%21%3E_)
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