最近在教学北帅大版小学数学(2013年审定)第十一册第三单元“搭积木比赛”一课时,有这样一个情境:在上课前研读教材时,我发现至少需要4个小正方体就可以满足从正面和左面分别看到的形状,如图1所示。上面搭成的这个立体图形中,后一排的唯一一个正方体与前排的第一个正 Recently in teaching North handsome large primary school mathematics (2013 validation) eleventh unit third “building blocks competition ” a class, there is such a situation: before studying in the teaching materials, I found that at least 4 small The cube can satisfy the shapes seen from the front and the left, respectively, as shown in Figure 1. Above the three-dimensional graphics, the only cube in the back row is the same as the first one in the front row