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长方体和正方体的表面积是在学生认识掌握了长方体、正方体特征的基础上进行教学的.学生在上节课练习制作长方体、正方体纸盒的过程中,已为学习表面积积累了感性材料,再通过教材第87页倒1的教学,使学生理解什么是表面积,并学会表面积的计算方法.为了逐步培养学生的空间观念,教学中要求学生由看实物计算表面积,到看立体图计算表面积,再到由已知长、宽、高三个条件就能想象实物图形来计算表面积.由于在实际生活中,有时不需要
The surface areas of cuboids and cubes are taught on the basis of the students' understanding of cuboid and cuboid features.In the process of making cuboid and cuboid cartons in the previous class, students have accumulated sensory materials for the learning surface area, On page 87, teaching a student to understand what surface area is and how to calculate the surface area.In order to develop students' space concepts step by step, students are required to calculate the surface area from the perspective of physical calculation, to calculate the surface area of the three- Know the length, width and height of the three conditions will be able to imagine physical graphics to calculate the surface area.Because in real life, sometimes do not need