A(x1,y1,z1),B(x2,y2,z2）,C(x3,y3,z3)AB=OB-OA =(x2-x1, y2-y1, z2-z1)AC=OC-OA =(x3-x1, y3-y1, z3-z1)平面法向量=ABxAC=(x2-x1, y2-y1, z2-z1) x (x3-x1, y3-y1, z3-z1)
牛金牛赵白高
