已知
为空间两两垂直的单位向量,且
则数量积
=_________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd279988ae4df15bf6d26cafb3b90ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7127eaa21dd4a9662981ed72ab2da7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fe4d834e8eaca89ceaf9c64cdabd9.png)
更新时间:2020-05-25 19:39:35
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【知识点】 求空间向量的数量积
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填空题-双空题
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较易
(0.85)
【推荐1】如图,空间四边形的各边和对角线长均相等,E是BC的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b70ead87edce4c41ef531e5faac1c.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e715833d14ea5cad4e199947b02c5921.png)
______
(填“<”“=”或“>”).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b70ead87edce4c41ef531e5faac1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e715833d14ea5cad4e199947b02c5921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b7f456b6f7fcced1b8dce00c2877cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/6/a9fef327-701d-4901-9fe6-9473c915323c.png?resizew=148)
您最近一年使用:0次
填空题-单空题
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较易
(0.85)
【推荐2】已知空间单位向量
,
,
两两互相垂直,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d575255200836929989ad6e9478dde.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8315ec34019d719771152be2252106e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf39ca3294f5520518dd4f1c0609876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a47d4bdd597408b84bbd1e13a274ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb402f751a6a6614e4e8ee0b0c85e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d575255200836929989ad6e9478dde.png)
您最近一年使用:0次