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一、创设情境,引入新课师:你衣服上的学具名字叫魔术铅笔,请同学们(在不破坏学具和衣服的前提下)尝试取下魔术铅笔,思考:你是怎样解下来的?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:有解下来的么?(没有)哪个来说一说,在这个过程中你有哪些发现?(绳子太短)(有)说一说你是怎样解下来的?解下来的想办法系上。师:(没有)那要解开它,只要大家认真学完这节课,此难题就会迎刃而解。(有)学生只会操作,说不出原因,教师要适时导入新课。
First, create the situation, the introduction of a new class teacher: Your clothes on the name of the school called magic pencil, please students (without compromising school supplies and clothing under the premise of trying to remove the magic pencil, thinking: How did you get it Design intent: Combining reality, asking questions, triggering speculation, resulting in the need to explore the trilateral relations. Teacher: Did you get any solution? (None) Which one did you say during the process? (The rope is too short.) (有) Talk about how you got it down. on. Teacher: (no) that should be solved, as long as we finish the lesson conscientiously, this problem will be solved. (Yes) students will only operate, can not tell the reason, teachers should be timely import new lesson.