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1 . 已知三个向量
,
,
共面,且均为单位向量,
,则
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524594bf0942ed86f56fc1eee120a81a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414c4b7cbf90e2447c829e2feb24d8e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ab573b603783d15d45aeb7bd865fc9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9卷引用:甘肃省天水市第一中学2019-2020学年高一下学期第二学段考试(期末)数学试题