名校
1 . 已知
、
为单位向量,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1309d8e3a465ef223d1af0c7a01316ec.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9381a44d11ad720ce8fb72e410a101f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1309d8e3a465ef223d1af0c7a01316ec.png)
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2019-09-29更新
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1226次组卷
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9卷引用:天津市耀华中学2020-2021学年高一下学期期中数学试题