题目

1.已知}x=2e^-t,y=3e^2t,=( )CA. (3)/(2)B. -(3)/(2)C. -3D. -(1)/(3)

1.已知$\begin{cases}x=2e^{-t},\\y=3e^{2t},\end{cases}$则$\frac{dy}{dx}\mid_{t=0}=( )$C

A. $\frac{3}{2}$

B. $-\frac{3}{2}$

C. -3

D. $-\frac{1}{3}$

题目解答

答案

C. -3