等差数列{an}{bn}的前n项和分别为An,Bn,An/Bn=7n+1/4n+27,a5/b5=?
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等差数列{an}{bn}的前n项和分别为An,Bn,An/Bn=7n+1/4n+27,a5/b5=?等差数列{an}{bn}的前n项和分别为An,Bn,An/Bn=7n+1/4n+27,a5/b5=?
等差数列{an}{bn}的前n项和分别为An,Bn,An/Bn=7n+1/4n+27,a5/b5=?
等差数列{an}{bn}的前n项和分别为An,Bn,An/Bn=7n+1/4n+27,a5/b5=?
等差数列{an}{bn}的前n项和分别为An,Bn,An/Bn=7n+1/4n+27,a5/b5=?
An/Bn=7n+1/4n+27
A9/B9=64/63
[9(a1+a9)/2]/[9(b1+b9)/2]=64/63
(9*2a5)/2)/(9*2b5/2)=64/63
a5/b5=64/63
An/Bn=7n+1/4n+27
A9/B9=64/63
,a5/b5=[(9/2)*(2a5)]/[(9/2)(2b5)]=A9/B9=64/63
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