（1）你若要求A9/B9,则直接待9到题目中的等式
A9/B9 = 48 / 17
（2）你若要求a9/b9,则a9/b9= 2a9/2b9
=（a1+a17）/（b1+b17）
=[17(a1+a17)/2] / [17(b1+b17)/2]
=A17/B17
=8/3
已知等差数列{an}和{bn},他们的前n项之和为An和Bn,若An/Bn=(5n+3)/(2n-1)
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