等差数列{an}中,a2=4,S6=42. (1)求数列的通项公式an; (2)设bn=2 (n+1) an ,Tn=b
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等差数列{an}中,a2=4,S6=42. (1)求数列的通项公式an; (2)设bn=2 (n+1) an ,Tn=b1+b2+…+bn,求T6
![等差数列{an}中,a2=4,S6=42. (1)求数列的通项公式an; (2)设bn=2 (n+1) an ,Tn=b](/uploads/image/z/5504616-0-6.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca2%3D4%2CS6%3D42%EF%BC%8E+%EF%BC%881%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8Fan%EF%BC%9B+%EF%BC%882%EF%BC%89%E8%AE%BEbn%3D2+%28n%2B1%29+an+%2CTn%3Db)
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等差数列{an}中,a2=4,S6=42. (1)求数列的通项公式an; (2)设bn=2 (n+1) an ,Tn=b
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