[教学内容]“主视图、左视图、俯视图”(第一课时)(苏科版)七年级数学上册.[教材分析]本节课是苏科版七年级数学上册第五章“走进图形世界”第四节的第一课时.由于我们的生活空间是三维的,学生对图形的认识通常是从立体图形开始的,因此本教材一改老教材中从平面图形到立体图形的知识体系,而从学生身边的几何体入手来研究图形.本节课是学生经历了展开与折叠活动之后,再一次经历由三维几何体到二维平面图形转化的过程,其内容是新课程改革以来重点增加、着力加强的部分, [Teaching content] “main view, left view, top view ” (the first class) (Suke Edition) seventh grade mathematics on the volume. [Textbook analysis] This class is Su Ke version seventh grade mathematics on the fifth chapter Into the graphics world "the first lesson of the fourth quarter.As our living space is three-dimensional, students generally understand the graphics from the beginning of the three-dimensional graphics, so the textbook to change the old textbooks from graphic to three-dimensional graphics Of the knowledge system, and from the geometry of the students to start the study of graphics.This lesson is the students experienced the expansion and folding activities, once again through the process of transformation from three-dimensional geometry to two-dimensional graphics, its content is the new curriculum reform since Emphasis added, efforts to strengthen the part,