题目
题型:不详难度:来源:
(本小题满分10分)(注意:在试题卷上作答无效)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065712-75713.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065713-86564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065713-14311.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065713-28432.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065713-90622.gif)
(Ⅱ)现给出下列四个条件:①
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065714-87418.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065714-19879.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065714-94603.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065715-43274.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065712-75713.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065715-69986.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065715-54088.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065716-18960.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065716-20640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065716-50867.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065716-36451.gif)
(Ⅱ) 方法一:选择①③可确定
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065717-75946.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065717-58974.gif)
由余弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065717-60685.gif)
整理得
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065718-44736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065718-32094.gif)
(Ⅱ) 方法二:选择①④可确定
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065717-75946.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065718-58233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065718-99097.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065719-90578.gif)
由正弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065719-59914.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065719-71333.gif)
解析
核心考点
试题【(本小题满分10分)(注意:在试题卷上作答无效)的三个内角A,B,C所对的边分别为a,b,c, 向量且(Ⅰ)求的大小;(Ⅱ)现给出下列四个条件:①②③④.试从中】;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/20191104/20191104065705-31973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065705-54269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065706-30610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065706-51022.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065655-39629.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065655-19470.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065656-81267.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065656-41427.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065656-75401.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065656-16052.gif)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065657-25868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065657-42983.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065657-56521.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065647-88598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065647-64247.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065647-46542.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065647-47710.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065647-70268.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065647-95801.gif)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065648-19650.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065648-80334.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065648-17751.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065638-89478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065639-54516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065639-54516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065638-89478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065639-54516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065638-89478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065639-54516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065638-89478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065639-54516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065638-89478.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065634-53507.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065634-50032.gif)
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