题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041134-79944.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041134-90447.png)
解析
试题分析:由题意得:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041135-16872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041135-72612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041135-52235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041135-47294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041136-84088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041136-60266.png)
核心考点
试题【若的夹角为 .】;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/20191104/20191104041125-10152.png)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041126-37538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041126-56825.png)
(2)若存在实数k和t,满足
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041126-16987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041126-36364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041127-64848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041127-85578.png)
(3)根据(2)的结论,试求出k=f(t)在(-2,2)上的最小值.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041118-90534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041118-73068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041118-18185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041118-90534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041118-61427.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041112-31145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041113-23245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041113-99487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041113-15695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041113-12442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041113-23245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041113-99487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041113-23245.png)
A.外心 | B.内心 | C.重心 | D.垂心 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041106-35599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041106-10613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041107-38083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041107-43484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041107-44286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041107-39847.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041107-44286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041059-82003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041100-55722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041100-20684.png)
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