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观察入手讲清概念解答正、反比例应用题,首先要讲清正、反比例的概念。教学时,必须从观察分析入手,逐渐引入,引导学生在观察数量变化的过程中自己体会和理解正、反比例的意义。开始,我们用一个简单的例子引入。一列火车2小时行120公里,平均每小时行多少公里?怎样解这道简单的应用题,学生都能回答。我们接着问:8小时行180公里,平均每小时行多少公里?4小时行240公里,平均每小时行多少公里?5小时行300
Observe the concept to clarify the concept of positive and inverse proportion of application questions, we must first clarify the concept of positive and negative ratio. Teaching, we must start with the observation and analysis, and gradually introduced to guide students in the process of observing the number of changes in their own understanding and understanding of positive and negative sense of proportion. In the beginning, we introduce with a simple example. A train travels 120 kilometers two hours in a row, how many kilometers per hour on average? How to solve this simple application question, students can answer. We then ask: 8 hours 180 kilometers, the average number of kilometers per hour? 240 hours 4 hours, the average number of kilometers per hour? 5 hours 300