名校
1 . 已知单位向量
的夹角
,向量
.
(1)若
,求
的值;
(2)若
,求向量
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa9cb58002d6dcb6e5670419cf3f3dd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297ba9edb3ee2bf73d7fc779aab6f949.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076559f08d17fb25e82886e791719e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71aa00475428e1aa7c3e03a4d96e9d87.png)
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2020-09-13更新
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7卷引用:天津市第二中学2020-2021学年高二上学期开学考试数学试题