在立体几何里,建立直角坐标系运用向量 知识解题,是常见的一种方法,但一旦不具备 建立直角坐标系的条件或建立直角坐标系写 坐标很复杂时,可以考虑建立空间向量的基 底．若空间向量的基底比较好建立,有时比用 直角坐标系解题还简单．以下面常见的锥体、 柱体为例,和大家一起探讨． In the three-dimensional geometry, it is a common method to establish a rectangular coordinate system to use vector knowledge to solve problems. However, once the conditions for establishing a rectangular coordinate system or the coordinates for creating a rectangular coordinate system are not very complicated, it can be considered to establish the basis of the space vector. . If the base of the space vector is better established, it is sometimes simpler than solving the problem with rectangular coordinates. Take the following common cones and cylinders as an example to discuss with everyone.