有一$f(x,y)$，在$g(x,y)=0$條件底下求極值:
${\frak L}(x,y,\lambda)=f(x,y)+\lambda\cdot g(x,y)$
$$令\left\{ \begin{array}{l} \cfrac{\partial{\frak L}}{\partial x}=0 \\ \cfrac{\partial{\frak L}}{\partial y}=0 \\ \cfrac{\partial{\frak L}}{\partial \lambda}=0 \end{array}\right. $$
$(x,y) 為極值$
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