选材立序,借材立序,在一个正确“序”(一组图形)的引领之下,通过不断变式与深刻挖掘,让数学思维活动有机呈现,一脉相承,层层递进,生动诠释了“材料不在多,有内涵则行”这一朴实的教学理念。经过读序、思考与讨论,最终确定了由一组图形串联整堂课的知识点进行练习巩固,为学护航。一、读序——了解学生与教材《练习二》学生已经学得知识点主要有: Under the guidance of a correct “sequence ” (a group of graphics), through constant variation and profound excavation, the mathematics thinking activities are presented organically, and are inherited in the same strain, Vivid interpretation of the “material is not more, there is connotation is line ” This simple teaching philosophy. After reading sequence, thinking and discussing, it is finally confirmed that a series of graphic series concourses will be practiced and consolidated in order to escort the learning. First, read the sequence - to understand the students and teaching materials “Exercise II” students have learned knowledge points are: