Gaokao Math Practice Question
4. 设函数 $f(x)=\frac{1-x}{1+x}$, 则下列函数中为奇函数的是 $(\quad)$
- A.$f(x-1)-1$
- B.$f(x-1)+1$
- C.$f(x+1)-1$
- D.$f(x+1)+1$
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