已知
若
与
垂直,则
的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341597778b3b23dd8612582cbbd29386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187f6cc0eb7fe55284049b3ca757a094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad2e0f39e291976fcffd82bd5182c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2018-01-02 15:14:22
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