本文中的等积变形是指在面积不变的前提下,通过分割、平移、旋转、翻折等方法,将图形作适当变化,以达到解决问题的目的.合理利用等积变形,将对解题起到非常重要的作用.下面举例说明.一、平方差公式的推导例1如图1,边长为a的大正方形中有一个边长为b的小正方形.(1)请表示图1阴影 In this paper, the equal-area deformation refers to the method of segmentation, translation, rotation, folding, etc. to make appropriate changes to the problem in order to solve the problem. With the use of equal-area deformation, the solution will be solved. The question plays a very important role. Here are some examples. First, the derivation of the square difference formula is shown in Fig. 1. In a large square with a side length a, there is a small square with side length b. (1) Please indicate Figure 1. shadow