美国埃德华等编的《数学竞赛五百题》一书中有一道题目,题目新颖,富于探索性,耐人寻味。现将题目及其解法介绍如下: 题目如图1,将正方形纸片剪去三个角,移去三个等腰直角三角形。怎样将剩下的部分沿两条直线裁成三个部分,然后将这三部 There is a title in the book “Fifty Questions for Mathematical Competitions” edited by Edward E. and the United States. The topics are novel, full of exploratory and intriguing. The topic and its solution are introduced as follows: The topic is shown in Figure 1. Cut the square paper to three corners and remove the three isosceles right-angle triangles. How to cut the remaining part into three parts along two straight lines, and then put these three parts