题目
题型：不详难度：来源：
| a |
| b |
| c |
①（
| a |
| b |
| c |
| c |
| a |
| b |
| b |
| c |
| a |
| c |
| a |
| b |
| c |
③
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| a |
| b |
| b |
| A．1个 | B．2个 | C．3个 | D．4个 |
答案
| a |
| b |
| c |
| c |
| c |
| a |
| b |
| b |
| b |
| c |
（2）∵[（
| b |
| c |
| a |
| c |
| a |
| b |
| c |
| b |
| c |
| a |
| c |
| c |
| a |
| b |
| c |
（3）∵（
| a |
| b |
| a |
| b |
| a |
| a |
| b |
| b |
| a |
| b |
| a |
| b |
（4）∵（
| a |
| b |
| a |
| a |
| b |
| b |
| a |
| a |
| a |
| b |
| a• |
| b |
| b |
| a |
| b |
| a |
| b |
| b |
| a |
| b |
故选C．
核心考点
试题【设a、b、c为非零向量，下列等恒成立的个数有（ ）①（a•b）•c=（c•a）•b；②[（b•c）•a-（c•a）•b]•c=0；③a2-b2=（a+b）（a】；主要考察你对平面向量应用举例等知识点的理解。[详细]
举一反三
| m |
| n |
| m |
| n |
（1）求角B的大小；
（2）求sinA+cosC的取值范围．
| OP1 |
| OP2 |
| OP3 |
| OP1 |
| OP2 |
| OP3 |
| OP1 |
| OP2 |
| OP3 |
求证：△P1P2P3是正三角形．
| CA |
| CB |
| 1 |
| 2 |
| (|a 题型：b|)2-(a•b)2 |
（2）若
| CA |
| CB |
| 1 |
| 2 |
| a |
| 3x |
| 2 |
| 3x |
| 2 |
| b |
| x |
| 2 |
| x |
| 2 |
| π |
| 2 |
（1）求
| a |
| b |
| a |
| b |
（2）求函数f（x）=
| a |
| b |
| a |
| b |
| e |
| 4 |
| 5 |
| 3 |
| 5 |
| O1A1 |
| e |