练习是使学生掌握知识 ,形成技能 ,发展智力的重要手段 ,是数学学习的重要一环 ,数学知识的掌握 ,技能的形成 ,能力的培养以及良好学习习惯的养成 ,都要通过适当的练习来实现。根据练习不同的目的 ,其形成可以分为以下几种 :一、课前练习在新授课之前 ,一般都要设计课前练习 , Practice is an important means to make students master knowledge, form skills and develop intelligence. It is an important part of mathematics learning. The mastery of mathematics knowledge, the formation of skills, the cultivation of ability, and the development of good study habits all must be through appropriate exercises to fulfill. According to the purpose of different exercises, its formation can be divided into the following categories: First, the pre-class exercises Before the new lectures, generally have to design pre-class exercises,