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提起排列与组合,人们就会讲这是高中的数学内容,与小学数学没有关系。其实,小学数学中就有一些思考题渗透了这方面的知识。本文就小学课本数学第三册的两道有关思考题作点初步介绍和教法探讨。 1、第58页,练习十六,第8题: 用3、6、4三个数字卡片,可以排成几个不同的三位数?写出其中最大和最小的三位数。 这明显是一道3个相异元素的全排列问题,排列数列成算式应该是
Mentioning arrangement and composition, one would say that this is a high school math content that has nothing to do with elementary mathematics. In fact, there are some questions in primary school mathematics that infiltrate this knowledge. In this paper, elementary school textbooks on the third volume of mathematics two thought questions for a preliminary introduction and discussion of teaching methods. 1, Page 58, Exercises XVI, Issue 8: Using 3, 6, 4 three digital cards, can you arrange several different three-digit numbers? Write the three largest and smallest three digits. This is obviously a total arrangement of three different elements of the problem, the arrangement of numbers into the formula should be