题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083047-86870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083047-32452.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083047-96498.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083047-47025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083048-33221.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083048-79167.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083048-52287.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083048-76009.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083049-44375.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083049-90363.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083049-63133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083049-40286.gif)
由计算器得
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083050-26085.gif)
利用计算器中的
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083050-39118.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083050-39597.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083050-68987.gif)
核心考点
试题【设,,求及、间的夹角(精确到).】;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/20191104/20191104083042-78366.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083042-36334.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083042-50341.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083042-96088.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083043-75633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083033-90050.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083033-70154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083034-76811.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083034-40913.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083034-77031.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083034-54223.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083034-68504.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083035-92234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083026-77836.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083026-17365.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083026-22946.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083026-34730.gif)
(2)若|ka+b|=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083027-86349.gif)
(1)求证a与b不共线,并求a与b的夹角的余弦值;
(2)求c在a方向上的投影;
(3)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083009-58197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083009-58197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083009-58197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104083009-58197.gif)
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