课堂教学是进行教学活动的基本形式，我们应当想方设法优化课堂结构，减轻学生作业负担，提高课堂效果。怎样才能在有限的时间里，使学生既学到知识，又掌握基本技能、技巧，同时发展智力和能力呢？进行新旧联系。从数学教材内容编排体系看，新旧知识有着非常密切的联系。在新 Classroom teaching is the basic form of teaching activities, we should find ways to optimize the classroom structure, reduce the workload of students, improve classroom effect. How can we, for a limited period of time, enable students to not only acquire knowledge but also acquire basic skills and skills while developing their intelligence and ability? Make old and new contacts. From the mathematics textbook content arrangement system, the old and new knowledge has a very close relationship. New