如图,若正四面体
的棱长为1,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0772aa1bd117cacc2eb959d39da92151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1303344ccf2f51d3d4f99ed0f60eee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/a563099f-466d-490c-a58a-c6049c066eea.png?resizew=162)
A.![]() | B.![]() | C.![]() | D.1 |
23-24高二上·天津河东·期中 查看更多[2]
更新时间:2023-11-10 15:06:42
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【推荐1】已知平行六面体
,则下列四式中错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
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【推荐2】如图,在空间四边形OABC中,
,
,
,点M在线段OA上,且
,点N为BC的中点,则
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![](https://img.xkw.com/dksih/QBM/2020/2/16/2400371315499008/2401748574003200/STEM/e2c02ebe3c2a429386a0b84e0ae450c7.png?resizew=244)
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【推荐1】平行六面体(底面是平行四边形的四棱柱)
过顶点A的三条棱的夹角分别是
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
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【推荐2】如图,在平行六面体
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/803f046a-9f8f-4e3d-af06-b1a6bfe1e423.png?resizew=159)
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