Gaokao Math Practice Question
6. 当 $x=1$ 时, 函数 $f(x)=a \ln x+\frac{b}{x}$ 取得最大值 -2 , 则 $f^{\prime}(2)=()$
- A.-1
- B.$-\frac{1}{2}$
- C.$\frac{1}{2}$
- D.1
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