题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075028-13373.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075028-21602.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075029-26256.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
核心考点
试题【设向量与的模分别为6和5,夹角为120°,则等于A.B.C.D.】;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/20191104/20191104075024-32486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075024-85596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075025-81078.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075025-39912.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075025-70449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075025-39912.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075020-29847.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075021-94016.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075021-25123.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075021-31976.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075021-25123.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075021-31976.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075009-66329.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075010-89943.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075010-52991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075010-42796.gif)
(Ⅰ)若对任意实数t都有
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075011-54007.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075010-52991.gif)
(Ⅱ)令
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075011-53244.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075011-74213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075010-52991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075012-93758.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075012-61462.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075011-74213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075010-52991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075012-38797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075011-74213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075010-52991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075012-42850.gif)
(Ⅲ)在(Ⅱ)的条件下,求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075013-94372.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075005-33351.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075005-66291.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075006-74556.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075006-86454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075006-94868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075001-81066.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075001-43633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075001-56861.gif)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104075003-31125.jpg)
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