Gaokao Math Practice Question
己知函数 $f(x)=\frac{1}{1+2^{x}}$, 则对任意实数 $x$, 有 ($\quad$)
- A.$f(-x)+f(x)=0$
- B.$f(-x)-f(x)=0$
- C.$f(-x)+f(x)=1$
- D.$f(-x)-f(x)=\frac{1}{3}$
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