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克服解答正反比例应用题的各种错误解法,根本的方法就是要让学生深刻掌握正反比例的意义.本文就学生在五年制课本第十册作业中错得最多的几道比例应用题结合正、反比例的意义作如下剖析:一、不能认真审题,没有弄清题中数量关系等原因而造成解题的错误.例1.一个施工队安装一条水管,头6天装了224米.照这样的速度,又用了15天把水管全部装完.这条水管一共长多少米?(69页第10题)[错误解答]:解:设这条水管一共长x米.224/6=x/15 x=((224×15)/6) x=560答:这条水管一共长560米.[分析]:这是一道正比例应用题,学生之所以
Overcome the answer to the positive and negative application of the problem of various misunderstandings, the fundamental method is to enable students to master the meaning of positive and negative proportion.This paper on the students in the five-year textbook tenth book the most wrong way in the proportion of the number of applications combined with positive , The inverse proportion of the significance of the following analysis: First, can not seriously examine the problem, did not find out the number of problems such as the problem caused the wrong answer. Example 1. A construction team to install a water pipe, the first 6 days installed 224 meters. (69 page 10) [Wrong Answer]: Solution: Let this pipe a total length of x meters .224 / 6 = x / 15 x = ((224 × 15) / 6) x = 560 A: The water pipe has a total length of 560 meters. [Analysis]: This is a proportional application problem, the reason why students