新课程标准指出:“学生的数学学习内容应当是真实的、有意义的、富有挑战性的,这些内容要有利于学生主动地进行观察、实验、猜测、验证、推理与交流等数学活动。”众所周知,数学的教学内容比较抽象,某些内容对于学生而言比较难掌握,这就形成了教学的难点。而教学重点是在教学过程中要求学生必须掌握的内容。传统的教学方法在某些教学重点、难点的教学上有一定的局限性。在常规的教学中,由于受到时间、空间等多种因素的 The new curriculum standard states: “Students’ mathematical learning content should be real, meaningful and challenging. These contents should help students take the initiative to conduct mathematical activities such as observation, experiment, guesswork, verification, reasoning and communication. ”As we all know, mathematics teaching content is more abstract, some of the content is more difficult for students to master, which formed the teaching difficulties. The focus of teaching is the teaching process requires students to master the content. The traditional teaching methods have some limitations in some teaching focuses and difficult teaching. In conventional teaching, due to time, space and other factors