已知等差数列{an}的公差d>0,a2,a5是方程x^2-12x+27=0的两个根,数列{bn}的前n项和为tn,且tn=1-...已知等差数列{an}的公差d>0,a2,a5是方程x^2-12x+27=0的两个根,数列{bn}的前n项和为tn,且tn=1-1/2
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![已知等差数列{an}的公差d>0,a2,a5是方程x^2-12x+27=0的两个根,数列{bn}的前n项和为tn,且tn=1-...已知等差数列{an}的公差d>0,a2,a5是方程x^2-12x+27=0的两个根,数列{bn}的前n项和为tn,且tn=1-1/2](/uploads/image/z/1767787-43-7.jpg?t=%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E5%85%AC%E5%B7%AEd%3E0%2Ca2%2Ca5%E6%98%AF%E6%96%B9%E7%A8%8Bx%EF%BC%BE2-12x%2B27%3D0%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%A0%B9%2C%E6%95%B0%E5%88%97%EF%BD%9Bbn%EF%BD%9D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAtn%2C%E4%B8%94tn%3D1-...%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E5%85%AC%E5%B7%AEd%3E0%2Ca2%2Ca5%E6%98%AF%E6%96%B9%E7%A8%8Bx%EF%BC%BE2-12x%2B27%3D0%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%A0%B9%2C%E6%95%B0%E5%88%97%EF%BD%9Bbn%EF%BD%9D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAtn%2C%E4%B8%94tn%3D1-1%EF%BC%8F2)
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