《九年制义务教育数学课程标准》为义务教育阶段数学教学提供了新的理念和新的教学模式 .1　总体要求数学教学要促进学生全面、持续、和谐地发展 ,就必须重视通过对生活情景的体验或实践交流形成数学模型 ,然后对数学模型加以解释的过程 .在这一过程中 ,不仅强调对知识的理解和 The “Nine-year Compulsory Education Mathematics Curriculum Standard” provides a new concept and a new teaching model for mathematics teaching in the compulsory education phase.1 The general requirement of mathematics teaching to promote students’ comprehensive, sustained, and harmonious development requires attention to the adoption of life scenarios. Experience or practice exchange to form a mathematical model, and then explain the process of mathematical model. In this process, not only the understanding of knowledge and