题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034309-43053.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-89481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-73910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-30776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-89481.png)
(2)若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-73910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-46480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-40743.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034311-58333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034311-51195.png)
解析
试题分析:(1)首先根据向量的坐标表示及向量模的计算
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034311-30839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034311-51147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034312-31754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-89481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-73910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-46480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034312-66186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034310-40743.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034312-54391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034313-24093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034313-89530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034313-55078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034313-87028.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034314-56735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034314-52839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034314-82613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034314-82435.png)
核心考点
试题【已知向量.(1)若为向量与向量的夹角,求的值;(2)若向量与向量垂直,求的值.】;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
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034256-31283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-12846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-68768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-58041.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-14843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-58020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-15496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-20328.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-82983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-54367.png)
(3)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034257-73483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034258-95294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034258-83194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034258-90696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034258-23980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034258-79901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034258-26489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034258-70222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034258-27126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034249-10687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034249-72935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034249-67205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034249-97761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034250-95584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034239-44101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034240-35902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034240-97434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034240-41008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034240-53880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034241-68232.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034232-26750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034232-78960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034232-52579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034233-13622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034232-26750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034225-52666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034225-73082.png)
A.1 |
B.-1 |
C.1或-1 |
D.不确定,与B的大小,BC的长度有关 |
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