题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-85969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-28105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-21257.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-28952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-52167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-83748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-13898.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013605-54772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013605-77693.png)
解析
试题分析:(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-85969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-28105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-28952.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013605-22076.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013605-50771.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013605-51641.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013606-95732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013606-82954.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013606-63370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013605-77693.png)
注:由
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013606-95732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013606-21085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013605-77693.png)
点评:此类问题题先要应用向量的有关知识及二倍角公式将已知条件化简,然后再利用函数的性质求出参数m的值
核心考点
试题【已知向量=(,1),=(,1),R.(1)当时,求向量 +的坐标;(2)若函数|+|2为奇函数,求实数的值.】;主要考察你对平面向量的基本定理及坐标表示等知识点的理解。[详细]
举一反三
A.(-2,-1) | B.(2,1) | C.(3,-1) | D.(-3,1) |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013553-75687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013553-43890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013554-21167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013554-26748.png)
A.-1 | B.1 | C.-2 | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013549-55433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013549-59560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013549-49968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013550-78850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013544-41012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013545-85861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013545-82629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013545-97604.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013545-45251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013546-30664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013546-66205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013546-34625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013539-94419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013539-35463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013539-49210.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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