大侠们,等差数列中,公差d>0,前n项和为Sn,且满足a2*a4=45,a1+a5=14,求(1)数列{an}通项公式及Sn.(2)令bn=1/(an^2-1),数列{Cn}满足c1=-1/4,Cn+1-Cn=bn,求数列{Cn}通项公式Cn.(3)求f(n)=n/9-bn/cn的最小值.
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![大侠们,等差数列中,公差d>0,前n项和为Sn,且满足a2*a4=45,a1+a5=14,求(1)数列{an}通项公式及Sn.(2)令bn=1/(an^2-1),数列{Cn}满足c1=-1/4,Cn+1-Cn=bn,求数列{Cn}通项公式Cn.(3)求f(n)=n/9-bn/cn的最小值.](/uploads/image/z/15027342-6-2.jpg?t=%E5%A4%A7%E4%BE%A0%E4%BB%AC%2C%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E4%B8%AD%2C%E5%85%AC%E5%B7%AEd%3E0%2C%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E4%B8%94%E6%BB%A1%E8%B6%B3a2%2Aa4%3D45%2Ca1%2Ba5%3D14%2C%E6%B1%82%EF%BC%881%EF%BC%89%E6%95%B0%E5%88%97%7Ban%7D%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%E5%8F%8ASn.%EF%BC%882%EF%BC%89%E4%BB%A4bn%3D1%2F%28an%5E2-1%29%2C%E6%95%B0%E5%88%97%7BCn%7D%E6%BB%A1%E8%B6%B3c1%3D-1%2F4%2CCn%2B1-Cn%3Dbn%2C%E6%B1%82%E6%95%B0%E5%88%97%7BCn%7D%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8FCn.%283%29%E6%B1%82f%28n%29%3Dn%2F9-bn%2Fcn%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC.)
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