高等教育出版社 4.点的坐标 l(XV 2 (yZ X a(x,y) H x 1. a'a=aay =Aa"=xA aa =aa=Aa y 3. a'a=aa,=aa=z 工图学教学资源库1. aaz = aay =Aa = xA 2. aax = aaz =Aa = yA 3. aax =aay = Aa= zA 4. 点的坐标 y z x y x z