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教学内容:人教版小学数学5年级上册,第4单元,第69～70页稍复杂的方程例2、例3。教材简析及设计思路:这两个例题都出现于现实问题情境,使学生在具体的情境中感悟数量之间的关系,学会列方程解决实际问题。例2可抽象为两积之和的数量关系,也可以拓展成两积之差、两商之差的数量关系,具有举一反三的意义。例3的问题含有两个未知数。在算术中称为“和差”“和倍”“差倍”问题。如果用算术方法解,思路特殊,需要
Teaching content: PEP Primary 5 Maths, Volume 4, pp. 69 ~ 70 Slightly more complex equations Example 2, Example 3. Analysis of teaching materials and design ideas: These two examples are presented in the context of the reality of the problem, so that students in a specific context to understand the relationship between the number of learned column equations to solve practical problems. Example 2 can be abstracted as the sum of the two products and can also be expanded to the difference between the two products. The quantitative relationship between the two businesses has the same meaning. The problem of Example 3 contains two unknowns. In arithmetic, the problem is called “bad” and “bad” times “”. If using mathematical methods, special ideas, needs