教学实践证明,要使学生的数学水平和能力在原有基础上得到提高,教师必须想方设法调动学生学习的积极性、主动性,让学生动手动脑,在探索和实践中通过自己的操作体验,运用迁移规律,发现前后知识间的联系,产生新的认知感受; Teaching practice has proved that in order to make the students’ mathematics level and ability be improved on the basis of the original, the teacher must find ways to mobilize the enthusiasm and initiative of the student to learn, let the students start their brains, and explore and practice their own operational experience, the use of migration law , Find the connection between before and after the knowledge, resulting in new cognitive experience;