博客园可以直接写数学公式

推荐维基百科的LaTex数学公式参考

 

$dz = \frac{\partial z}{\partial u}du + \frac{\partial z}{\partial v}dv$

...

$V(\Omega) = \int_{a}^{b} A(x)\,dx = \int_{a}^{b} \left( \int_{\varphi_{1}(x)}^{\varphi_{2}(x)}f(x,y)dy\right)\,dx$

 

$\oint_{C}\boldsymbol{F}\cdot d\boldsymbol{r} = \oint_{C} Pdx + Qdy = \iint_{D} \left( \frac{\partial Q}{\partial x} - \frac{\partial P}{\partial y} \right)\,dxdy$

 

$f: \mathbb{R} \times \mathbb{R} \to \mathbb{R}$

 

$\nabla f = \frac{\partial f}{\partial x}\boldsymbol{i} + \frac{\partial f}{\partial y}\boldsymbol{j}$

$\nabla f = f_{x}^{\prime}\boldsymbol{i} + f_{y}^{\prime}\boldsymbol{j} + f_{z}^{\prime}\boldsymbol{k}$