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学习目标:通过动手操作学具自主掌握三角形三边关系并会简单应用;积累探索问题的方法和经验.学习过程:(一)创设情境,引入新课.师:同时套在你衣服的扣眼上的这根小棍叫魔术铅笔,请同学们(在不破坏绳套和衣服的前提下)尝试取下魔术铅笔,并思考:你为什么能够取下来!(设计意图:结合实际,提出问题,引发猜测,产生探究三边关系的需求)师:有谁解下来了?(没有)那也说一说,在这个过程中你没有取下来的原因(绳子太短).
Learning Objectives: Learn the Triangular Triangular Relationship Through Hands-on Learning and Easily Apply it; Develop Methods and Experiences for Exploring Problems Learning Process: (a) Create a Context and Introduce a New Class Teacher: Put on the Buttonhole of Your Clothes This stick is called a magic pencil, and ask the students to remove the magic pencil (without damaging the rope cover and clothes) and think about why you can remove it! (Design intent: Guess that there is a need to explore the trilateral relations.) Teacher: Who has come down? (No) And that’s why you did not take it down in the process (the rope is too short).