Gaokao Math Practice Question
3. (5 分) 曲线 $y=\frac{x}{x+2}$ 在点 $(-1,-1)$ 处的切线方程为（ $）$
- A.$y=2 x+1$
- B.$y=2 x-1$
- C.$y=-2 x-3$
- D.$y=-2 x-2$
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