如图,正方体
中,棱长为2.
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860389546188800/2861609580716032/STEM/8ece14ab-3cdb-46a0-aea7-e7a4f3896e67.png?resizew=260)
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b32dd693b1b42951f7cfa360bfa0851.png)
_____________ ;
(2)若点E在对角线DB上,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44011cff6b0e127d10013aa9516ed04b.png)
______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860389546188800/2861609580716032/STEM/8ece14ab-3cdb-46a0-aea7-e7a4f3896e67.png?resizew=260)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b32dd693b1b42951f7cfa360bfa0851.png)
(2)若点E在对角线DB上,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44011cff6b0e127d10013aa9516ed04b.png)
更新时间:2021-11-29 10:22:30
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【知识点】 求空间向量的数量积
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______ .
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【推荐2】如图,四面体
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/786429b0-7e95-4b09-a747-8a3f75e32952.png?resizew=144)
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