在学生牢固掌握平行四边形的判定定理并能灵活运用的基础上,作为教学内容的延伸与拓展,能否引导学有余力的学生进一步分析、探索和发现平行四边形的其他判定方法呢?那么,如下的教学设计就是试图通过学生的活动,即结构分析、提出猜想,作出判断、剔除谬误,把平行四边形判定方法的来龙去脉搞清楚,让 Based on the student’s firm grasp of the decision theorem of parallelograms and its flexibility in use, as an extension and extension of teaching content, can students who have ample ability to further analyze, explore, and discover other parallelogram determination methods? Then, as follows, The teaching design is to try to understand through the student’s activities, that is, structural analysis, making conjectures, making judgments, eliminating errors, and clarifying the ins and outs of parallelogram determination methods.