题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044950-26882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044950-52230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-45582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-31062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-59978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-11170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-89532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-38801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-90956.png)
A.8 | B.9 | C.16 | D.18 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-88923.png)
所以由向量的数量积公式得| AB | •| AC | •cos∠BAC=2
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-88923.png)
∴| AB || AC |=4,
∵S△ABC
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044952-16801.png)
由题意得,
x+y=1-
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044952-16801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044952-16801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-90956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-90956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044952-47894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044952-47894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044952-36281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044952-12840.png)
故选C
核心考点
试题【已知△ABC的面积为1,设是△内的一点(不在边界上),定义,其中分别表示△,△,△的面积,若,则的最小值为( ) A.8B.9C.16D.18】;主要考察你对解三角形应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044945-61351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044945-94210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044945-88497.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044939-46352.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044939-65854.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044939-44662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044939-15102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044940-82940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044940-21607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044940-98202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044933-83315.png)
A.![]() | B.![]() | C.![]() | D.![]() |
已知:△ABC中角A、B、C所对的边分别为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044925-41444.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044926-73564.png)
(1)求角C的大小;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044926-65130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044926-15867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044926-49599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044923-20492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044923-76872.png)
A.135° | B.90° | C.45°或135° | D.30° |
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