题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030536-82043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030536-73090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-21668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-32410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-41148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-84693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030536-82043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030536-73090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-31148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-58875.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-41148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-84693.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030538-47451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-41148.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030538-80523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030538-76833.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030538-87918.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030539-41889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030539-13178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030539-77784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030539-81768.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030539-92743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030540-66998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030540-75221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030537-82864.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030540-46526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030540-38104.png)
故选
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030540-61284.png)
【考点】三角函数求值;恒成立问题;平面向量的数量积.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030528-56834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030528-85838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030528-77067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030529-20115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030529-41434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030529-58865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030529-47265.png)
(1)求边
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030529-58865.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030529-89124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030529-39622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030517-43865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030517-42409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-56322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-26649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-25606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-51160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-37480.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-42992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-25606.png)
(2)求剪下的铁皮三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-25606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030518-20183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030506-39041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030506-81854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030506-73165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030506-54885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030506-73165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030507-67472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030507-91812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030507-91462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030506-54885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030507-67472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030507-88536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030507-91812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030508-96979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030507-67472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030507-91812.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030500-61472.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030454-81929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030454-47130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030455-77309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030455-67090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030455-18009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030456-67636.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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