Gaokao Math Practice Question
9. (5 分) 已知等比数列 $\left\{a_{n}\right\}$ 满足 $\left.a_{1}=\frac{1}{4}, a_{3} a_{5}=4 （ a_{4}-1\right)$, 则 $a_{2}=(\quad)$
- A.2
- B.1
- C.$\frac{1}{2}$
- D.$\frac{1}{8}$
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