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向:小学数学第八册第92页17题:“用1、2、3、4、5、6、7、8、9九个数字,写出三个大小相等的分数,每个数字只许用一次。”应如何解答? 答:首先让学生把题的内容弄清楚:这九个数字都要用上,不能漏掉一个;这九个数字,每个只能用1次,不能重复使用;写出的三个分数必须是等价分数(分数值大小相等)。此题没有明显的规律,思路也复杂不一,可以从以下几方面引导。 1.三个等价分数中至少有两个能约分,或三个都能约分,约成最简分数后三个分数相同。
To: mathematics in elementary school eighth volume, page 92, 17 questions: “Use nine numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9 to write three equal-sized scores, each number only Use once.” What should be answered? A: First, let the students clarify the content of the question: These nine numbers must be used, and one cannot be omitted. These nine numbers can only be used once and cannot be reused. The three written scores must be equivalent scores (the scores are equal in size). There are no obvious laws on this topic, and the ideas are also mixed and can be guided from the following aspects. 1. At least two of the three equivalent scores can be approximated, or all three can be approximated, and the three scores are the same after they have reached the minimum score.