要学好立体几何,关键之一就在于能够把空间的形体,通过想象画出它的直观图,从画出的直观图想象出它所反映的空间的形体。对此初学者会感到一定的困难。克服这一难点,是一个重要的课题,而正方体对学生来说,他们是比较熟悉的。在日常生活中接触到的教室,方凳、魔方等都是正方体的缩影。这对我们培养 One of the keys to learning three-dimensional geometry is to be able to visualize the shape of space, visualize it through imagination, and visualize the shape of the space it reflects. Beginners will feel certain difficulties. Overcoming this difficulty is an important issue, and the cube is more familiar to students. In the classrooms that are exposed to everyday life, square stools, cubes, etc. are miniatures of the cube. This trains us