随堂练习1：函数 f(z)=u(x,y)+iv(x,y) 在 点 z=x+yi 处的导数公式错误的是( )A. f'(z) = (partial u)/(partial x) + i (partial v)/(partial x) B. f'(z) = (partial u)/(partial x) - i (partial u)/(partial y) C. f'(z) = (partial v)/(partial y) + i (partial v)/(partial x) D. f'(z) = (partial u)/(partial y) + i (partial v)/(partial y)

A. $ f'(z) = \frac{\partial u}{\partial x} + i \frac{\partial v}{\partial x} $

B. $ f'(z) = \frac{\partial u}{\partial x} - i \frac{\partial u}{\partial y} $

C. $ f'(z) = \frac{\partial v}{\partial y} + i \frac{\partial v}{\partial x} $

D. $ f'(z) = \frac{\partial u}{\partial y} + i \frac{\partial v}{\partial y} $