题目
题型：不详难度：来源：
| e |
| a |
| a |
| e |
| 2 |
| 3 |
| a |
| e |
答案
| a |
| e |
| a |
| a |
| e |
| a |
| a |
| e |
| 2 |
| 3 |
所以|
| a |
| a |
| e |
| 2π |
| 3 |
| 1 |
| 2 |
故答案为：-2
核心考点
试题【已知e为单位向量，|a|=4，a与e的夹角为23π，则a在e方向上的投影为______．】；主要考察你对平面向量数量积的意义等知识点的理解。[详细]
举一反三
| a |
| b |
| a |
| b |
| π |
| 3 |
（Ⅰ）求
| a |
| b |
（Ⅱ）向量
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| 0 |
| a |
| b |
| a |
| c |
| b |
| c |
| a |
| b |
| a |
题型：
|，则
∥
．其中真命题有______．（写出所有真命题的序号）
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |