因为an,bn是等差数列
所以
(a5+a13)/(b5+b13)
=A17/B17
=(4*17+2)/(5*17-5)
=70/80
=7/8
如仍有疑惑,欢迎追问.祝：
若两个等差数列{an}{bn}的前n项和分别为An、Bn,且满足An/Bn=(4n+2)/(5n-5)(,则a5+a13
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