已知函数f(x)=log3(ax+b)的图象经过点(1,1)和点(5,3),且数列{an}满足an=f^-1(n),记数列{an}的前n项和为SnSn(∈N*)1.求数列{an}的通项公式 2.记Cn=3an+t/2Sn-n ,且数列{Cn}为递增数列,即对n∈N*,恒有Cn>Cn+1成立,
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![已知函数f(x)=log3(ax+b)的图象经过点(1,1)和点(5,3),且数列{an}满足an=f^-1(n),记数列{an}的前n项和为SnSn(∈N*)1.求数列{an}的通项公式 2.记Cn=3an+t/2Sn-n ,且数列{Cn}为递增数列,即对n∈N*,恒有Cn>Cn+1成立,](/uploads/image/z/2807836-52-6.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dlog3%28ax%2Bb%29%E7%9A%84%E5%9B%BE%E8%B1%A1%E7%BB%8F%E8%BF%87%E7%82%B9%281%2C1%29%E5%92%8C%E7%82%B9%285%2C3%29%2C%E4%B8%94%E6%95%B0%E5%88%97%7Ban%7D%E6%BB%A1%E8%B6%B3an%3Df%5E-1%28n%29%2C%E8%AE%B0%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASnSn%28%E2%88%88N%2A%EF%BC%891.%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%8F+2.%E8%AE%B0Cn%3D3an%2Bt%2F2Sn-n+%2C%E4%B8%94%E6%95%B0%E5%88%97%7BCn%7D%E4%B8%BA%E9%80%92%E5%A2%9E%E6%95%B0%E5%88%97%2C%E5%8D%B3%E5%AF%B9n%E2%88%88N%2A%2C%E6%81%92%E6%9C%89Cn%3ECn%2B1%E6%88%90%E7%AB%8B%2C)
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