《全日制义务教育数学课程标准(实验稿)》指出:“有效的数学学习活动不能单纯地依赖模仿与记忆,动手实践、自主探索和合作交流应该成为学生学习数学的重要方式,学生的数学学习活动应当是一个生动活泼的、主动的和富有个性的过程。”众所周知,学生在学习时表现的自觉性、积极性、独立性,是从事学习活动的一种心理能动状态。因此,教学中应 Full-time compulsory education mathematics curriculum standards (experimental draft) pointed out: “effective mathematics learning activities can not simply rely on imitation and memory, hands-on practice, independent exploration and cooperation and exchange should become an important way for students to learn mathematics, students’ mathematics Learning activities should be a lively, active and personalized process. ”" As we all know, the performance of students in learning self-consciousness, enthusiasm, independence, is engaged in a psychologically dynamic state of learning activities. Therefore, teaching should be