已知等差数列{an}中,公差d>0,其前n项和为Sn,且满足a2·a3=45,a1+a4=14若c=-1/2,求:f(n)=bn/[(n+2005)*b(n+1)],(n属于N*)的最大值.bn=Sn/(n+c),c为非零常数。an=4n-3,c=1/2时{bn}也为等差数列。
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![已知等差数列{an}中,公差d>0,其前n项和为Sn,且满足a2·a3=45,a1+a4=14若c=-1/2,求:f(n)=bn/[(n+2005)*b(n+1)],(n属于N*)的最大值.bn=Sn/(n+c),c为非零常数。an=4n-3,c=1/2时{bn}也为等差数列。](/uploads/image/z/1761542-62-2.jpg?t=%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2C%E5%85%AC%E5%B7%AEd%3E0%2C%E5%85%B6%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E4%B8%94%E6%BB%A1%E8%B6%B3a2%C2%B7a3%EF%BC%9D45%2Ca1%2Ba4%EF%BC%9D14%E8%8B%A5c%3D-1%2F2%2C%E6%B1%82%EF%BC%9Af%28n%29%3Dbn%2F%5B%28n%2B2005%29%2Ab%28n%2B1%29%5D%2C%28n%E5%B1%9E%E4%BA%8EN%2A%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC.bn%3DSn%2F%28n%2Bc%29%2Cc%E4%B8%BA%E9%9D%9E%E9%9B%B6%E5%B8%B8%E6%95%B0%E3%80%82an%3D4n-3%2Cc%3D1%2F2%E6%97%B6%7Bbn%7D%E4%B9%9F%E4%B8%BA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E3%80%82)
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