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工程问题反映的数量关系同整数应用题中工作总量、单位时间工作量(即工作效率)与工作时间的关系是相同的,但不告诉我们具体的工作总量,而是把工作总量用抽象的1表示。单位时间的工作量也不是具体的量,而是用工作总量的几分之一来表示。所以尽管这类问题解题思路与整数中的相同,但开始学习时学生往往不易理解。如何突破这一教学难点呢?这就需要我们充分认识新旧知识的内在联系,巧作迁移,利用学生先前获得的认知结构去积极
The relationship between quantity and quantity reflected in engineering problems is the same as the total amount of work in integer application, the workload per unit time (ie, work efficiency) and working time, but it does not tell us the specific total amount of work. Instead, Abstract 1 means. The workload per unit of time is not a specific quantity, but a fraction of the total work volume. So although the problem-solving ideas are the same as those in integers, students often find it hard to understand when starting to learn. How to break through this difficult teaching? This requires us to fully understand the inherent relationship between old and new knowledge, clever to migrate, to take advantage of the cognitive structure of students previously obtained to actively