Gaokao Math Practice Question
9. 设函数 $f(x)=\ln |2 x+1-| \ln |2 x-1|$, 则 $f(x)(\quad)$
- A.是偶函数, 且在 $\left(\frac{1}{2},+\infty\right)$ 单调递增
- B.是奇函数, 且在 $\left(-\frac{1}{2}, \frac{1}{2}\right)$ 单调递减
- C.是偶函数, 且在 $\left(-\infty,-\frac{1}{2}\right)$ 单调递增
- D.是奇函数, 且在 $\left(-\infty,-\frac{1}{2}\right)$ 单调递减
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