题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035807-80272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035807-65393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035808-23340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035808-63311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035808-77658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035809-87709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035809-16818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035809-74603.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035808-77658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035809-72256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035809-30091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035810-79525.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035810-20771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035810-19610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035810-26688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035811-37344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035811-85740.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035811-45395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035811-42999.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035812-27607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035812-39466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035812-55754.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035812-50028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035813-43203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035813-17740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035809-87709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035813-96112.png)
如图在线段
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035809-30091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035809-87709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035813-47645.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035813-81688.png)
又在
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035814-14256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035814-46541.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035814-67179.png)
故答案为9.
【考点】三点共线的判定;向量的数量积.
核心考点
试题【在中,,,,,点满足,则的值为______】;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
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035759-65395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035800-41967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035800-42648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035759-65395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035800-65480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035759-65395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035800-98928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035801-89375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035801-70833.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035753-28525.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035754-83545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035748-30918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035748-72655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035748-66219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035749-70970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035749-27152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035749-29555.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035741-20115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035741-25163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035742-96204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035742-52422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035742-10264.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035731-60544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035731-47866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035732-21604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035732-78248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035732-88420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035733-75313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035733-89743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035731-47866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035733-65155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035733-38307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104035734-31605.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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