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4·3关于立体几何的教学立体几何的教学是一个困难问题,许多人都认为,学立体几何可以培养“空间想像力”.其实,什么是空间想象力说来也玄,下面举一个例,在近年高考与各种“辅导材料”中,这种“题型”的内容很多.下面可算是最简单的了.设有一个立方体,边长为1,过O′,A,C三点作一
4.3 Teaching Three-dimensional Geometry The teaching of three-dimensional geometry is a difficult problem, and many people think that learning three-dimensional geometry can foster “spatial imagination.” In fact, what is spatial imagination is mysterious. Here’s an example. In recent years, college entrance examination and a variety of “counseling materials”, this “question type” a lot of content. The following can be regarded as the most simple.With a cube, the side length of 1, over O ’, A, C three for one