已知等差数列an的公差d大于0,且a2,a5是方程x^2-12x+27=0的两根,数列bn的前n项和为Tn,且Tn=1-1/2bn已知等差数列an的公差d大于0,且a2,a5是方程x^2-12x+27=0的两根,数列bn的前n项和为Tn,且Tn=1-1/2bn (1)
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![已知等差数列an的公差d大于0,且a2,a5是方程x^2-12x+27=0的两根,数列bn的前n项和为Tn,且Tn=1-1/2bn已知等差数列an的公差d大于0,且a2,a5是方程x^2-12x+27=0的两根,数列bn的前n项和为Tn,且Tn=1-1/2bn (1)](/uploads/image/z/1092296-56-6.jpg?t=%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97an%E7%9A%84%E5%85%AC%E5%B7%AEd%E5%A4%A7%E4%BA%8E0%2C%E4%B8%94a2%2Ca5%E6%98%AF%E6%96%B9%E7%A8%8Bx%5E2-12x%2B27%3D0%E7%9A%84%E4%B8%A4%E6%A0%B9%2C%E6%95%B0%E5%88%97bn%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BATn%2C%E4%B8%94Tn%3D1-1%2F2bn%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97an%E7%9A%84%E5%85%AC%E5%B7%AEd%E5%A4%A7%E4%BA%8E0%EF%BC%8C%E4%B8%94a2%EF%BC%8Ca5%E6%98%AF%E6%96%B9%E7%A8%8Bx%5E2-12x%2B27%3D0%E7%9A%84%E4%B8%A4%E6%A0%B9%EF%BC%8C%E6%95%B0%E5%88%97bn%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BATn%EF%BC%8C%E4%B8%94Tn%3D1-1%2F2bn+%EF%BC%881%EF%BC%89)
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