七年级北师大版数学课本的主体内容框架包括“数与代数”、“空间与图形”、“统计与概率”、“课题学习”四个部分,其中“空间与图形”部分就是常说的几何内容,是学生在整个初中阶段学习的重点与难点．在七年级《数学》(上册)中,“空间与图形”仅仅涉及了简单的 The main content frame of the 7th grade Beijing Normal University’s version of mathematics textbook includes the following four parts: “Number and Algebra”, “Space and Graphics”, “Statistics and Probability”, and “Subject Learning”. The “Space and Graphics” part is often said. The content of geometry is the focus and difficulty for students to study throughout the junior high school. In the seventh grade mathematics (first volume), “space and graphics” only involved simple