本节课的设计遵循“直观感知——操作确认——思辩论证”的认识过程,注重引导学生通过观察、操作交流、讨论、有条理的思考和推理等活动,引导学生从中抽象概括出定理。对定理的运用从易到难,由浅入深地强化对定理的认识,有利于培养学生思维能力和解决问题的能力。 The design of this lesson follows the cognition process of “intuitive perception - confirmation of operation - argumentative argumentation”, and guides the students to guide students to summarize abstractly through observation, operation and communication, discussion, structured thinking and reasoning theorem. The use of the theorem from easy to difficult, from shallow to deep understanding of the theorem, is conducive to cultivating students’ ability to think and solve problems.