动手操作是学生建立感性经验的重要手段,也是学生主动构建知识的有效途径。现代课堂教学的新理念指出:数学课堂教学是一种师生双边参与的、动态变化的过程,在这一过程中学生和教师各自扮 Hands-on operation is an important means for students to establish emotional experience, but also an effective way for students to construct knowledge on their own initiative. The new concept of modern classroom teaching points out that mathematics classroom teaching is a process in which both teachers and students participate and change dynamically. In this process, students and teachers play their own roles