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在应用题教学中,加强替换练习,有利于揭示各类应用题之间的内在联系,开拓解题思路,提高解题能力。下面以比和分数两类应用题的替换练习为例,谈谈自己的作法。一、设计比和分数相互替换的基础练习,加深对概念的理解。1.7∶8写成分数是(7/8)4/5又可读作(4比5) 2.甲速是乙速的2/3,甲速与乙速的比是(2∶3)。3.实际产量比计划产量多1/7,实际产量与计划产量的比是(8∶7)。
In the teaching of application problems, to strengthen the practice of substitution is conducive to reveal the inherent relationship between various types of application questions, explore solutions to problems and improve the ability to solve problems. Let's take a look at your own practice by taking the practice of replacing exercises with two types of ratio questions and scores as an example. First, the basic design than the replacement of scores and scores of exercises, to deepen the understanding of the concept. 1.7: 8 The score is written as (7/8) 4/5 and can be read as (4 to 5). 2. A speed is 2/3 of B speed, A speed ratio is 2: 3. 3. The actual output is one-seventh more than the planned output, the ratio of the actual output to the planned output is (8: 7).