题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043512-52671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043512-30049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043512-89868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043512-97240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043512-73433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-14093.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-38929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-37353.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043512-73433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-46210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-11083.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-37044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-76643.png)
解析
试题分析:(1)解法一是利用
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-38929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-60870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-36480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-37353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-38929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-61703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-46492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043513-37353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-28173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-51410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-89792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-24109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-82948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-29264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-24109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-82948.png)
试题解析:(1)解法1:由题可知:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-30011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-28461.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-40133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-90706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-25649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-13330.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-98033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-14870.png)
解法2:由题可知:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-30011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-28461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-65689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-50705.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-25649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-34920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-55558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043516-14870.png)
(2)解法1:由(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-47945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043514-28173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-98353.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-59652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-76874.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-35707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043518-95862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043518-77958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043518-62751.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043518-72506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043518-38828.png)
解法2:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043518-77958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043519-89232.png)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043515-40133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043519-34209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-47945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043517-35707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043519-75321.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043519-17406.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043519-75620.png)
核心考点
试题【在平面直角坐标系中,以为始边,角的终边与单位圆的交点在第一象限,已知.(1)若,求的值;(2)若点横坐标为,求.】;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/20191104/20191104043500-95935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043501-41538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043501-39471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043501-15902.png)
A.![]() ![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043448-23224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043448-87214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043448-63763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043448-69973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043449-56376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043449-23511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043449-34493.jpg)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043443-47198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043444-33542.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043444-70228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043444-85463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043444-23766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043445-40166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043435-95899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043435-49429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043435-55487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043435-28802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043436-85088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043436-16500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043436-40781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043437-45046.jpg)
A.![]() | B.![]() | C.9 | D.6 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-82787.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-83457.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-16535.png)
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