问题

Questions in category: 多元函数 (Multivariate functions).

设 $w = f (x + y + z, x y z)$ , $f$ 具有二阶连续偏导数, 求 $\frac{\partial^{2} w}{\partial x \partial z}$ .

Posted by haifeng on 2023-03-29 13:07:13 last update 2023-03-29 13:07:13 | Answers (1) | 收藏

设 $w = f (x + y + z, x y z)$ , $f$ 具有二阶连续偏导数, 求 $\frac{\partial^{2} w}{\partial x \partial z}$ .