17-18高三上·上海浦东新·开学考试
名校
1 . 已知单位向量
满足
,则
的夹角为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d0f5edd2ad69fa56e7782b85bba717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b3934b043ed0c86d21f75ee69ac782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d0f5edd2ad69fa56e7782b85bba717.png)
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2 . 在
中,
,
,
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de2bd6fbcdae3867a0bf29138c9ba6d.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de2bd6fbcdae3867a0bf29138c9ba6d.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037124354048/1573037130424320/STEM/d8187c3233a34d238d2571878f920f23.png?resizew=242)
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3 . 若向量
满足
∥
,且
⊥
,则
=______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70076f85a3ead4993f37468103c6f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b82fd0a9c2e52f23e40329e663a621c6.png)
您最近一年使用:0次