课程标准指出,学生的数学学习活动是一个生动活泼的、主动的富有个性的过程。学生是学习的主人,教师是教学的组织者、引导者和合作者;教师的任务就是为学生营造良好的学习环境和氛围,给学生提出适当的要求,提示学习的方法,促进学生带着任务通过自己的探索,找出问题的答案。因此 Curriculum standards point out that a student’s math learning activity is a lively, proactive and personalized process. Students are the masters of learning. Teachers are the organizers, guides and collaborators of teaching. The task of teachers is to create a good learning environment and atmosphere for students, to make appropriate demands to students, to prompt learning methods and to promote students’ Through their own exploration, find the answer to the question. therefore