题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020609-26149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020609-40781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020610-88347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020610-22171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020610-64986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020610-97050.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020610-11343.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020611-41790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-79237.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-60147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-60098.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-27373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020613-67327.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-27373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020613-13804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020613-35892.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020613-75392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020614-25069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020614-58870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020614-58777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020614-75450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-79237.png)
解:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-27373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020613-67327.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020614-51066.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020615-88453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020615-80287.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-60147.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-27373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020613-13804.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020613-35892.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020613-75392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020615-80287.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020615-54895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020614-58870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020614-58777.png)
综上,
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020615-34941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020614-75450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020612-60098.png)
核心考点
试题【在中,角所对的边分别为,向量 ,.已知 .(1)若,求角A的大小;(2)若,求的取值范围.】;主要考察你对正弦函数的图象与性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020559-18457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020559-37798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020559-55550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020600-41284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020600-52230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020600-66472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020600-96230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020601-71543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020601-30509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020559-37798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020601-26019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020601-85858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020547-72174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020547-51596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020547-32452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020547-76109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020528-12144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020528-34354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020529-45278.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020516-45313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020517-48465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020517-95455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020517-81985.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020511-61572.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020511-93056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020511-34777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020511-93056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020512-63034.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020511-93056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020512-31515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020511-93056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911020512-11763.png)
A.1 | B.2 | C.3 | D.4 |
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