MathJax:微积分常用符号

\partial \partial

\int \int

\iint \iint

\oint \oint

\rm {d} d \rm {d}

例子:

  • \int_{\alpha(x)}^{\beta(x)}\frac{\partial{f(x,y)}}{\partial x}\rm dy +\beta'(x)
    α ( x ) β ( x ) f ( x , y ) x d y + β ( x ) \int_{\alpha(x)}^{\beta(x)}\frac{\partial{f(x,y)}}{\partial x}\rm dy +\beta'(x)

  • \mathop{\iint}\limits_D\left(\frac{\partial Q}{\partial x}-\frac{\partial P}{\partial y} \right )dxdy=\oint _LPdx+Qdy:
    D ( Q x P y ) d x d y = L P d x + Q d y \mathop{\iint}\limits_D\left(\frac{\partial Q}{\partial x}-\frac{\partial P}{\partial y} \right )dxdy=\oint _LPdx+Qdy

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转载自blog.csdn.net/xuejianbest/article/details/84860748