数列{a(n)}的前n项和为S(n),a(1)=1,a(n+1)=2S(n)+1(n≥1)(Ⅰ)求{a(n)}的通项公式(Ⅱ)等差数列{b(n)}的各项为正,其前n项和为T(n),且T(3)=15,又a(1)+b(1),a(2)+b(2),a
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![数列{a(n)}的前n项和为S(n),a(1)=1,a(n+1)=2S(n)+1(n≥1)(Ⅰ)求{a(n)}的通项公式(Ⅱ)等差数列{b(n)}的各项为正,其前n项和为T(n),且T(3)=15,又a(1)+b(1),a(2)+b(2),a](/uploads/image/z/12396761-17-1.jpg?t=%E6%95%B0%E5%88%97%EF%BD%9Ba%28n%29%EF%BD%9D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAS%EF%BC%88n%EF%BC%89%2Ca%EF%BC%881%EF%BC%89%3D1%2Ca%EF%BC%88n%2B1%EF%BC%89%3D2S%EF%BC%88n%EF%BC%89%2B1%EF%BC%88n%E2%89%A51%EF%BC%89%EF%BC%88%E2%85%A0%EF%BC%89%E6%B1%82%EF%BD%9Ba%28n%29%EF%BD%9D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%EF%BC%88%E2%85%A1%EF%BC%89%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BD%9Bb%28n%29%EF%BD%9D%E7%9A%84%E5%90%84%E9%A1%B9%E4%B8%BA%E6%AD%A3%2C%E5%85%B6%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAT%EF%BC%88n%EF%BC%89%2C%E4%B8%94T%EF%BC%883%EF%BC%89%3D15%2C%E5%8F%88a%EF%BC%881%EF%BC%89%2Bb%EF%BC%881%EF%BC%89%2Ca%EF%BC%882%EF%BC%89%2Bb%EF%BC%882%EF%BC%89%2Ca)
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