如图,点
是棱长为2的正方体
的表面上一个动点,
是线段
的中点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/11ddc92d84d188c66b435664a7e7b5a4.png)
A.若点![]() ![]() ![]() ![]() |
B.当点![]() ![]() ![]() ![]() |
C.当直线AP与AB所成的角为![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() ![]() |
更新时间:2024-05-20 19:53:58
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【推荐1】如图,棱长为2的正方体
中,
分别为棱
的中点,
为面对角线
上一个动点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/42a5d91a-9455-4824-9300-21989c17f112.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ae536809b1161fd4e83fdc7f42be96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c3d0d039281f93c604d0e85b21bda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/42a5d91a-9455-4824-9300-21989c17f112.png?resizew=179)
A.三棱锥![]() |
B.线段![]() ![]() ![]() ![]() ![]() |
C.设直线![]() ![]() ![]() ![]() ![]() |
D.三棱锥![]() ![]() |
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解题方法
【推荐1】《九章算术》中,将底面为长方形且有一条侧棱与底面垂直的四棱锥称之为阳马,将四个面都为直角三角形的四面体称之为鳖臑.如图,在阳马
中,侧棱
底面
,且
分别为
的中点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/f5b121a8-a908-4197-a2e6-1c6f2cca27b1.png?resizew=156)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1b66f834d3bc121bec30a3f06be773c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e9ce7d745b895ce1269f8cdd7e406d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/f5b121a8-a908-4197-a2e6-1c6f2cca27b1.png?resizew=156)
A.若![]() ![]() |
B.![]() ![]() ![]() |
C.点S是平面![]() ![]() |
D.过点E,F,G的平面与四棱锥![]() ![]() |
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【推荐2】已知正方体
的棱长为4,
是棱
上的一条线段,且
,点
是棱
的中点,点
是体对角线
上的动点(包括端点),则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f115f2683c0422042f1846450885e7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
A.存在某一位置,![]() ![]() |
B.三棱锥![]() ![]() |
C.当![]() ![]() ![]() |
D.二面角![]() ![]() |
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