现行《中学数学教学大纲》指出 :“在数学教学中 ,要坚持理论联系实际 ,增强学生用数学的意识 .应使学生通过背景材料 ,并运用已有知识 ,进行观察、实验、比较、猜想、分析、综合、抽象和归纳 ,将实际问题抽象为数学问题 ,建立起数学模型 ,从而解决问题并拓宽自己的知识面 .要? The current “Middle School Mathematics Syllabus” points out: "In mathematics teaching, we must adhere to the theory and practice, and enhance students’ awareness of mathematics. Students should be allowed to pass through background materials and apply existing knowledge to observe, experiment, compare, and guess. Analyze, synthesize, abstract and generalize, abstract practical problems into mathematical problems, establish mathematical models, solve problems and broaden their knowledge.