Gaokao Math Practice Question
若曲线 $y=x^{-\frac{1}{2}}$ 在点 $\left( a, a^{-\frac{1}{2}}\right)$ 处的切线与两个坐标围成的三角形 的面积为 18 , 则 $a=$ ($\qquad$)
- A.64
- B.32
- C.16
- D.8
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