1 . 在四面体
中,棱
,
,
两两垂直,且
,
,
,
为
的重心,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c25ec02546d1b78b3c97548c0c1938.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a99044cdedf9e67bffd16a7eeeadf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef520a2657abdf14fa6818c380b596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c25ec02546d1b78b3c97548c0c1938.png)
您最近一年使用:0次
2022-09-07更新
|
1146次组卷
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7卷引用:河北省邯郸市大名县第一中学2022-2023学年高二上学期第一次月考数学试题
2 . 如图所示,在正方体
中,点
是侧面
的中心,若
,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13f0ba5a06163b9ec2e088745a3ea31.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c543cbb6a60aec717d58fbf7e8e5606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13f0ba5a06163b9ec2e088745a3ea31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/92b0656f-3724-43a7-a168-6ffc63ce3712.png?resizew=172)
您最近一年使用:0次
2021-01-03更新
|
598次组卷
|
8卷引用:河北省邯郸市魏县第五中学2022-2023学年高二上学期第二次月考数学试题
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