题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081555-16340.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081556-21285.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081556-37744.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081556-95912.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081555-16340.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081556-37744.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081556-45771.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081557-16056.gif)
解析
核心考点
试题【若,,且与的夹角为锐角,则的取值范围是 】;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/20191104/20191104081548-55432.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081548-57209.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081548-94277.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081549-66614.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081549-31755.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081540-62315.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081540-34928.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081540-44160.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081541-74492.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081541-53829.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081535-72454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081535-55423.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081535-46775.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081535-29655.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081535-41720.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081536-44326.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081526-45091.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081526-20141.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081526-45091.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081527-20667.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081527-11635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081526-45091.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081527-15345.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081527-40597.gif)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081528-85087.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081527-11635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081526-45091.gif)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081528-15831.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081528-45284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081528-85087.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081521-69528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081521-39727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081522-24865.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081522-44617.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081522-42174.gif)
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