Question

Задание приложено...

Answer 1

9. $\displaystyle z=3x^2+5x-y^3+1$
$\displaystyle z'_x=6x+5$
$\displaystyle z'_y=-3y^2$

10. $\displaystyle z=e^{u/t } = e^{u*t^{-1}}$
$\displaystyle z'_u=e^{u/t }*\frac{1}{t} =\frac{e^{u/t}}{t}$
$\displaystyle z'_t=e^{u/t }*u*(-1)*t^{-2}=-\frac{e^{u/t}*u}{t^2}$