[math]\frac{\partial z}{\partial x}= \lim_{\Delta x \to 0}\frac{f(x+\Delta x, y) - f(x,y)}{\Delta x}[/math]
[math]\frac{\partial z}{\partial y}= \lim_{\Delta x \to 0}\frac{f(x, y+\Delta y) - f(x,y)}{\Delta x}[/math]
- 適合年齡
- 14 – 18
- 語言
- Chinese Traditional / 繁體中文
