教学内容:北师大版《小学数学》四年级下册P92～P93。教学目标:1.让学生理解方程概念,感受方程思想。2.让学生经历从生活情境到方程概念的建构过程,体会方程是刻画现实世界的数学模型。3.培养学生观察、描述、分类、抽象、概括、应用等能力。教学设想:本课的教学设计,基于对数 Teaching content: Beijing Normal University edition of “primary school mathematics” fourth grade of the next volume P92 ~ P93. Teaching Objectives: 1. Let students understand the concept of equations, feel the equation ideas. 2. Let students experience from the context of life to the concept of equation construction process, the experience of the equation is to characterize the real world mathematical model. 3. Students develop observation, description, classification, abstraction, generalization, application and other capabilities. Teaching Assumptions: The lesson design, based on logarithm