等差数列{an} {bn}前n项和为An Bn,An/Bn=(7n+2)/(4n+27),求an/bn
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![等差数列{an} {bn}前n项和为An Bn,An/Bn=(7n+2)/(4n+27),求an/bn](/uploads/image/z/2707570-10-0.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D+%7Bbn%7D%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAAn+Bn%2CAn%2FBn%3D%287n%2B2%29%2F%284n%2B27%29%2C%E6%B1%82an%2Fbn)
等差数列{an} {bn}前n项和为An Bn,An/Bn=(7n+2)/(4n+27),求an/bn
等差数列{an} {bn}前n项和为An Bn,An/Bn=(7n+2)/(4n+27),求an/bn
等差数列{an} {bn}前n项和为An Bn,An/Bn=(7n+2)/(4n+27),求an/bn
A(2n-1)=(a1+a(2n-1))/2*(2n-1)=2an/2*(2n-1)=an*(2n-1)
同理B(2n-1)=b*(2n-1)
于是an/bn=A(2n-1)/B(2n-1)=(14n-5)/(8n+23)
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等差数列{an} {bn}前n项和为An Bn,An/Bn=(7n+2)/(4n+27),求an/bn
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证明:数列{an}为等差数列的充要条件是{an}前n项和Sn=An^2+Bn
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