19/31
An/Bn= [a1+(n-1)d]/[b1+(n-1)s]=2n/3n-1
对比得到：a1=2 d=4 b1=8 s=6
a10/b10 = 38/62 =19/31
已知{an},{bn}均为等差数列,前n项的和为An,Bn,且An/Bn=2n/(3n+1),求a10/b10的值
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