物理

璕涗H2O

Yes

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是哪个拉格朗日定理，微积分还是群论的

哦这个我熟，右边是向量的数乘不是点乘，可以理解成伸缩变换，所以左右两边都是向量，证明把A，B，C设出来就行了

看看物理上有没有什么特殊意义，我是数竞生，三个向量的叉乘一般不满足结合律。