在运用空间向量求有关线面角和二面角的问题时经常要求平面的法向量,笔者在此介绍用三阶行列式快速求平面的法向量的方法,供大家参考。一、预备知识二阶行列式和三阶行列式的定义分别如 When using the space vector to solve the problem of the line face angle and the dihedral angle, the normal vector of the plane is often required. The author introduces the method of using the three-order determinant to quickly find the normal vector of the plane for your reference. First, the definition of the second-order determinant and the third-order determinant of pre-requisite knowledge