1 . 已知向量
,
,其中
,
.
(1)当
时,求
的取值范围;
(2)当
时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5bd153a0fc4620181edc18a6adcd5fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f99645c5aa5800b219c4d9f0baebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c11b2ebeb617a47ca9731b21076922a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4338dd5d6ac02dbb9d5069eb98f436d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854e16eb319ee454088f5b527cf6c4d5.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500d68f2678989a5ce7431cfd51b019d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93af88a7628c71d642d3a6df067c15f5.png)
您最近一年使用:0次
2 . 已知向量
,
.
(1)求
的值 ;
(2)求向量
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b31aebd84a09c58eda7b46872c553c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837930645a16b1889f33a9e92b5c59ae.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b023a599ea979d946808f4d1e7b15f5.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4ff655de43e2bfea4ed9ae34e36de0.png)
您最近一年使用:0次
2020-01-09更新
|
659次组卷
|
5卷引用:贵州省铜仁市2019-2020学年高一上学期期末数学试题
名校
解题方法
3 . 已知向量
.
(1)求
的值;
(2)求向量
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4224407f19a6fa9111a43845c8e42791.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3357a4707fbe4ef93661a64e88881d40.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ac082a2a9e4e80b95db3de38610a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
您最近一年使用:0次