一、题目
$f(u, v)$ 具有二阶连续偏导数, 且:
$$
g(x, y) = f(2 x+y, 3 x-y)
$$
$$
\frac{\partial^{2} g}{\partial x^{2}} + \frac{\partial^{2} g}{\partial x \partial y} – 6 \frac{\partial^{2} g}{\partial y^{2}} = 1
$$
(1) 求 $\frac{\partial^{2} f}{\partial u \partial v}$ 的值;
(2)若 $\frac{\partial f(u, 0)}{\partial u}=u \mathrm{e}^{-u}, f(0, v)=\frac{1}{50} v^{2}-1$, 求 $f(u, v)$.
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