对教材知识进行拓展性思考、训练是引导学生回归教材,走出题海,减轻学生课业负担,培养学生思维的深刻性和灵活性,进而提升数学学习能力的重要举措,教师利用习题课,从教材的习题出发,充分联想深究,沟通知识间内在联系,对于大面积提高教学质量,发展智力,开启学生数学思维都是至关 Extensive thinking and training of teaching materials is to guide students to return to teaching materials, to get out of the sea of ​​questions, to reduce the burden on students’ work, to cultivate the deepness and flexibility of students’ thinking, and to improve the ability to learn mathematics. Important actions are taken by teachers in the use of exercises. The starting point of the exercise is to fully associate it with the study of the inner relationship between the communication knowledge and to improve the quality of teaching in a large area, develop the intelligence, and open up the students’ mathematical thinking.