课内外练习是学生对学习内容的重复接触或重复反应 ;是学生学习数学、发展思维的一项经常性的实践活动 ,也是师生交流信息的一个窗口。要使学生牢固掌握某种知识或技能 ,必须重视课内外练习的设计。如果用划一的练习题去要求不同发展水平的学生 ,要么使学生吃不饱 ,要么使学生? Exercises both inside and outside the class are repeated or repetitive reactions of students to the learning content. It is a regular practice for students to learn mathematics and develop their thinking. It is also a window for teachers and students to exchange information. To make students have a firm knowledge of a certain skill or skill, must pay attention to the design of practice inside and outside the class. If you use a uniform practice to ask students of different levels of development, either to make students hungry, or to make students?