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Gaokao Math Practice Question

5. (5 分) 设函数 $f(x)=x^{3}+(a-1) x^{2}+a x$. 若 $f(x)$ 为奇函数, 则曲线 $y=f($ $x$ ) 在点 $(0,0)$ 处的切线方程为 ( )

  1. A.$y=-2 x$
  2. B.$y=-x$
  3. C.$y=2 x$
  4. D.$y=x$

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