多层次地教学长方体表面积沈长生笔者有幸听了一堂颇具特色的长方体表面积研究课，授课教师教学思路清晰，层层推进，使传授知识与发展智力有机结合。一、导入新知的三个层次１．再现旧知。师生各拿出一个长方体的纸盒，沿着棱剪开，再展平。如下图：教师提问，学生看图回... Multi-level teaching rectangular surface area Shen Changsheng I was fortunate to hear a distinctive cuboid surface area of ​​the study class, teaching teachers clear thinking, layers of promotion, so that the imparting of knowledge and development of intellectual organic integration. First, the introduction of new knowledge of the three levels 1. Reproduce the old knowledge. Teachers and students come up with a rectangular box, cut along the edge of the open, and then flattened. As shown below: Teacher questions, students look at the map back ...