“投影”是人教版九年级数学教材下册的内容,其与视图一起,可以看作是初中数学教学的收官之作,具有相当的重要性,因而也容易被选作公开课、比武课的材料.相对于一般的数学知识而言,投影知识带有鲜明的经验性、体验性和实践性.说其具有经验性,是因为投影在学生的生活中比较常见,有较多的内容可以用作学生学习的生活基础,也是因为在初二的物理学习中学生具有了影的形成的相关知识,其中的思维方式对投 “Projection ” is the content of the ninth grade mathematics textbook of the PEP, which together with the view can be regarded as the final result of mathematics teaching in junior high school. It is of considerable importance and therefore can be easily chosen as an open class , The material of contesting class.Compared with the common math knowledge, the projection knowledge has vivid empiricism, experientialness and practicality.It is said that it is experienced because the projection is more common in students’ life and has more Of the content can be used as the basis of life for students to learn, but also because the students in the first two physical learning has the shadow of the formation of the relevant knowledge, one of the ways of thinking on the vote