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《中小学数学》2015年第10期高磊的《A_4纸背后的数学秘密》一文.作者研究了A_4纸,对A_4纸进行了数学分割,马上联想到自己曾向上海常文武博士学习用A_4纸折七巧板的数学折纸实验活动,分割方法与高老师的分割基本类似.高老师对A_4纸的长宽以及尺寸都做了精细的研究,而且明确了A_4纸是2~(1/2):1的比率.本文想与大家分享常博士的两项折纸实验活动,以丰富高老师的A_4纸背后的数学秘密.一、A_4纸分割后折七巧板A_4纸分割后,比率为2~(1/2):1,面积也都是成比例的.而我国传统数学遗产七巧板它们的面积关系也正好
Gao Lei’s article “Mathematical Secrets Behind A_4 Paper.” The author studied A_4 paper and mathematically divided A_4 paper. He immediately remembered that he had studied with Dr. Chang Wenwu in Shanghai using A_4 Paper folding tangram mathematical origami experimental activities, segmentation and high teacher division basically similar to high teacher A_4 paper length and width and size have done a careful study, but also clear A_4 paper is 2 ~ (1/2): 1 ratio.This article wants to share Dr. Chang’s two origami experimental activities with you to enrich the mathematical secrets behind the high teacher’s A_4 paper.First, after the A_4 paper is split and folded, the A_4 paper is split, the ratio is 2 ~ (1 / 2): 1, the area is also proportional to the traditional math jigsaw puzzle their area is also exactly the area