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Update 2024052201.md
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NeptuneZhao authored May 30, 2024
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##### 1 无条件极值

都知道的, 前提需是 $AC - B^2 > 0$, 若为 $0$ , 则无法判断; 若 $<0$ , 则为鞍点。

当 $A > 0$ 时, 是极小值; 当 $A < 0$ 时, 是极大值。

##### 2 Lagrange乘子法
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- Rabbe判别法
- 积分判别法

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