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116问答网 > 初中一元一次方程应用题等量关系该怎么找？找到了又该怎么列方程呢？

初中一元一次方程应用题等量关系该怎么找？找到了又该怎么列方程呢？

2025-03-14 14:21:36

推荐回答（1个）

回答1：

这要具体的题目来讲解：如下题：

这是一个工程类题目，一般情况下要将这项工程看作“1”；从题词中可知甲队每天完成工程的1/15，乙队每天完成工程的1/9。题目的等量关系是：工程先由甲队做3天，再由甲乙两队合作完成剩余部分，问要多少天可以完成？即用整个工程减去甲队3天做的=甲乙两合作X天完成的，设：甲乙合作还需要X天，则有：1-（1/15）X3=（1/15+1/9）X。X=4.5天。

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