题目
题型:不详难度:来源:
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060041-14080.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060041-14080.png)
核心考点
试题【已知︱a︱="3," ︱b︱=4,且(a+kb)⊥(a-kb),则k= 】;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.(-∞,-2)∪![]() | C.![]() ![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060025-41104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060026-79831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060026-49037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060026-56397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060026-70777.png)
A.![]() | B.![]() | C.![]() | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060015-13589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060015-98944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060016-35059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060015-13589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060016-95740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060016-82869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060017-48113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060017-11760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060010-53552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060011-83600.png)
连接原点
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060011-85820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060011-31299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060011-65646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060012-46409.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060012-77752.png)
A.1 | B. 2 | C.3 | D. 4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060005-17597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060005-83213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060005-41647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060006-36616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060006-79609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104060006-21478.png)
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