Gaokao Math Practice Question
12. 设 $a \neq 0$, 若 $x=a$ 为函数 $f(x)=a(x-a)^{2}(x-b)$ 的极大值点, 则
- A.$a<b$
- B.$a>b$
- C.$a b<a^{2}$
- D.$a b>a^{2}$
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