题目
题型:不详难度:来源:
OC、OB与OC的夹角都为30°,且∣OA∣=∣OB∣="1," ∣OC∣=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020858-58838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020858-64418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020858-32346.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020858-38507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020859-36079.png)
A.2 B.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020858-58838.png)
C.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020859-59135.png)
答案
解析
![]() |
过点
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020859-54447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020900-72737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020900-72737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020900-58640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020900-50864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020900-41251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020901-35052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020901-45883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020901-60625.png)
核心考点
试题【(理)如图,平面内有三个向量OA,OB,OC,其中OA与OB的夹角为60°,OA与OC、OB与OC的夹角都为30°,且∣OA∣=∣OB∣="1," ∣OC∣=,】;主要考察你对平面向量的基本定理及坐标表示等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020853-55278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020853-57929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020853-82697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020854-22572.png)
A.2 | B. 0 | C.![]() | D.-2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020848-72264.png)
A.3 | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020841-73637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020841-58351.png)
的射影分别是O1和A1,若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020842-95481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020841-73637.png)
A.![]() | B.-![]() | C.2 | D.-2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020837-58045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020837-28909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020837-58045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020837-28909.png)
A 4 B 5 C 6 D 7
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020828-12355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104020829-10246.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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