论文部分内容阅读
在小学数学上的分数应用题是一个教学重难点,我在用算术法解分数、百分数的应用题,往往由于有些数量的变化,分数的单位“1”也不随之发生变化,解答这类应用题就比较麻烦,经过分析找出这些数量中会有一个固定不变的量,也就是不变量,并以此为突破口,认真分析题目中的已知条件和问题,问题得以解决。一、抓住总量不变例如:某工厂甲乙两车间原有人数的比是7∶3,现在从甲车间调30人到乙车间,这时两个车间人数的比是3∶2,求甲乙两个车
In primary school mathematics score application problem is a teaching difficult, I am using arithmetic method to solve the fraction, the percentage of the problem, often due to some changes in the number, the unit of “1” does not change, answer this Class application problems are more troublesome, after analysis to find out that there will be a fixed amount of these quantities, which is invariant, and as a breakthrough, careful analysis of the known conditions and problems in the problem, the problem can be solved. First, to seize the total unchanged For example: a factory A and B two original ratio of the number of workshops is 7: 3, and now transferred from a workshop B to B, then the ratio of the number of two workshops is 3: 2 A two cars