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在利用向量解决立体几何问题时,选择适当的基底能给我们解题带来方便.基底主要有两类:一类是能建立空间直角坐标系,另一类是不能建立空间直角坐标系.下面用几个例题说明如何利用向量基底来解决这两类问题.一、许多问题都在一些特殊背景中出现,所涉及的点线面常在一些特殊的几何模型中,在这类模型结构中,空间直角坐标系容易建立
In the use of vector to solve the problem of three-dimensional geometry, the choice of the appropriate substrate can give us a solution to the problem. There are two main types of substrates: one is to create space Cartesian coordinates, the other is not to create a rectangular Cartesian coordinate system. A few examples show how to solve these two kinds of problems by using vector basement: First, many problems appear in some special backgrounds, and the points and lines involved are often in some special geometric models. In this kind of model structure, Space Cartesian coordinates easy to set up