2020-II-01

12-06-2023 app.cch 尚無留言

答案：C

\begin{array}{cl} \frac{6 x}{(3 x^{- 5})^{- 2}} \\ = & \frac{6 x}{3^{- 2} x^{- 5 \times - 2}} \\ = & \frac{6 x \times 9}{x^{10}} \\ = & \frac{54}{x^{9}} \end{array}