《一次函数》是北师大版八年级上册第四章的内容,在学习这一章之前的准备知识有七年级下册的《平行线与相交线》《变量之间的关系》,八年级上册第三章的《位置与坐标》。这三章是学习一次函数的准备知识,也是数形结合思想的完整体现,更是后续学习《反比例函数》《二次函数》的基础,所以这一章是本册最重要的内容。学习完这一章之后,如何复习这一章是教师关注的问题。如果把本章知识重复讲一次,再做一张单元测试题,我认为这只是 The “one-time function” is the content of the eighth edition of the Beijing Normal University Volume IV of the fourth chapter, in the preparation of this chapter before the knowledge of the seventh grade volumes of “parallel lines and intersection lines”, “the relationship between variables,” eighth grade Chapter III of the “position and coordinates.” These three chapters are the preparation knowledge to learn a function, but also the complete reflection of the combination of number and form, and the basis of the “quadratic function” of “inverse proportion function”, so this chapter is the most important content of this book. After learning this chapter, how to review this chapter is the teacher’s concern. If we repeat the knowledge of this chapter to do a unit test, I think this is just