《数学课程标准(2011年版)》指出:“教学活动是师生积极参与、交往互动、共同发展的过程。有效的教学活动是学生学与教师教的统一。”“学生学习应当是一个生动活泼的、主动的和富有个性的过程。认真听讲、积极思考、动手实践、自主探索、合作交流等,都是学习数学的重要方式。学生应当有足够的时间和空间经历观察、实验、猜测、计算、推理、验证等活动过 ”Mathematics Curriculum Standard (2011 Edition)“ states: ”Teaching activities are the process of active participation, interaction and mutual development of teachers and students.“ Effective teaching activities are the unification of student learning and teacher education. ”Students should learn A lively, active and personalized process.Abundant listening, positive thinking, hands-on practice, independent exploration, cooperation and exchange, are important ways to learn mathematics.Students should have enough time and space to experience, observe, experiment, Guessing, calculating, reasoning, verification and other activities