题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054221-58562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054221-57530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054221-98537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054221-80888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054221-55095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054221-69045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054222-13220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054222-78824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054222-56372.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054222-66385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054221-57530.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054222-68675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054221-58562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054222-49189.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054223-28659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054223-76999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054223-33358.png)
解析
试题分析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054223-10786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054223-63591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054223-94169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-35212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-30499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-85494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-70428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-85516.png)
(2)(法一)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-75708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-36070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054225-55519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054225-16508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054225-20471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054225-86290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054225-82144.png)
(法二)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-75708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054224-36070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054225-86316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054225-44852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054226-39674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054226-84853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054226-25741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054226-84769.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054226-53899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054227-28962.png)
点评:本题以向量的方式来给出题设条件,来考查三角有关的知识,较为综合。同时本题对答题者公式掌握的熟练程度要求较高,是一道中档题.
核心考点
试题【(本小题满分12分)在中,角为锐角,记角所对的边分别为设向量且与的夹角为(1)求的值及角的大小;(2)若,求的面积.】;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/20191104/20191104054210-43260.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054202-92817.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054154-63657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054154-88181.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054148-39185.png)
A.等腰三角形 | B.等边三角形 |
C.直角三角形 | D.等腰直角三角形 |
动点,若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054146-19345.png)
A.重心 | B.垂心 | C.外心 | D.内心 |
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