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一、利用“曹冲称象”的故事导入,让学生感受换元法的直观背景上课开始,大屏幕显示“曹冲称象”的故事.师:看了这个故事,你有什么想法?生1:曹冲这个人很聪明.我们要好好学习,做一个聪明的人.生2:把石头和大象换一下,解决了难题.师:说得好.“曹冲称象”的故事告诉我们:把石头和大象换一换,就能化难为易.其实,“曹冲称象”的故事里还隐含者一个重要的数学方法.下面我们先换一
First, the use of “Cao Chong said like ” into the story, so that students experience the intuitive background of the change of law class begins, the big screen shows “Cao Chong called like ” story: Teacher: read this story, do you have any idea Health 1: Cao Chong This guy is very smart and we have to study hard and be a smart person. Health 2: Change the stone and the elephant to solve the problem Teacher: Well said. The story tells us: the stone and the elephant for a change, we can make it difficult for easy.In fact, “Cao Chong said like ” story also implicit in an important mathematical method.