1 . 已知
,向量
与向量
垂直,
,
,2成等比数列,则
与
的等差中项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c328c9c4ec69c4275e27576fb61655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cee654c7591d3a2d7422bf3166c7416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59e01cd60a237a65953f4e24cf94c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
A.![]() | B.![]() | C.![]() | D.1 |
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2023-04-14更新
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3卷引用:山西省大同市2023届高三第一次阶段性模拟数学试题(B卷)