你平时会将学习中的一些心得体会记录下来吗?下面看看刘张睿同学的做法吧.在实数的学习中,我以为会进入“数”的天地,没想到在第一节课的学习中,让我印象最深的却是一种重要的图形——等腰直角三角形.怎么回事呢?在人教版数学教科书七年级下册第41页,有一个“探究”:能否用两个面积为1 dm~2的小正方形拼成一个面积为2 dm~2的大正方形?这个问题并不复杂,如图1,把两个小正方形沿对角线剪开后,再重新拼成一个大正 You will usually learn some experience experience recorded? Let’s take a look at the practice of Liu Zhangrui students in the real number of learning, I thought it would enter the “number” of the world, did not expect to learn in the first class In the most impressed me is an important figure - isosceles right-angled triangle. How else? In the PEP mathematics textbook under grade seven, page 41, there is a “inquiry ”: can Use two small squares with an area of ​​1 dm ~ 2 to form a large square with an area of ​​2 dm ~ 2. This problem is not complicated, as shown in Figure 1, cut two small squares diagonally, Make a big positive