1.本单元重点、难点分析向量是研究图形性质的有力工具,空间向量的引入使得对空间图形性质的研究代数化,体现了数形结合的思想.夹角和距离是对空间图形中点、线、面位置关系的定量描述,也是最主要的两大计算问题,用向量工具解决这两大计算问题显得直观简捷.空间向量也可以解决 1. The focus of this unit, the difficulty analysis vector is a powerful tool to study the nature of graphics, the introduction of space vector makes the study of the nature of the space graphics algebraic, embodies the idea of ​​combination of number and shape. Angle and distance is the point of space graphics, The quantitative description of the relationship between the line and the surface is also the most important two computational problems, and it is intuitive and simple to solve these two computational problems with vector tools. The spatial vectors can also be solved