如图,在正方体
中,点E是线段AC上的动点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/4448dbec-a955-49d3-aef7-a3f614138082.png?resizew=168)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/4448dbec-a955-49d3-aef7-a3f614138082.png?resizew=168)
A.![]() | B.![]() ![]() |
C.![]() | D.![]() |
更新时间:2022-08-23 14:33:50
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【推荐1】如图,在棱长为2的正方体
中,O为正方体的中心,M为
的中点,F为侧面正方形
内一动点,且满足
平面
,则( )
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882961875247104/2883161547997184/STEM/f172e385-1327-4521-850b-97b6d80bdde0.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ea211a573491409cb60f9fbe9a65cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0a3bb566b5d2404e4bb823abddfa9.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882961875247104/2883161547997184/STEM/f172e385-1327-4521-850b-97b6d80bdde0.png?resizew=179)
A.若P为正方体表面上一点,则满足![]() ![]() |
B.动点F的轨迹是一条线段 |
C.三棱锥![]() |
D.若过A,M,![]() ![]() ![]() ![]() ![]() |
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【推荐2】如图正方体
,
、
分别为
、
的中点,
是线段
上的动点(包括端点),下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/7f90d2d7-1ad0-4f60-ae84-292f0654ecde.png?resizew=212)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dc61d5de97b5a40be925b278ae494c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/7f90d2d7-1ad0-4f60-ae84-292f0654ecde.png?resizew=212)
A.对于任意![]() ![]() ![]() |
B.存在![]() ![]() ![]() |
C.存在![]() ![]() ![]() |
D.对于任意![]() ![]() ![]() |
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【推荐1】已知正四棱柱
的底面边为1,侧棱长为
,
是
的中点,
则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/9a47e7a0-dd66-4cd3-8b87-d09923ca0a29.png?resizew=156)
A.任意![]() ![]() |
B.存在![]() ![]() ![]() |
C.平面![]() ![]() ![]() |
D.当![]() ![]() ![]() |
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【推荐2】《九章算术》中将底面为直角三角形且侧棱垂直于底面的三棱柱称为“堑堵”;底面为矩形,一条侧棱垂直于底面的四棱锥称之为“阳马”.如图,在堑堵
中,
,且
,过点
分别作
于点
于点
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efac5edaa4aae53750360a4856bb3a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4305d8d52fe2cc79c78129652e64bb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b206c519c62ad1f75af30ffae5eab80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
A.四棱锥![]() | B.直线AE与平面ABC所成的角为![]() |
C.![]() | D.堑堵![]() ![]() |
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【推荐3】《九章算术·商功》:“斜解立方,得两堑堵,斜解堑堵,其一为阳马,一为鳖臑.阳马居二,鳖脚居一,不易之率也.合两鳖臑三而一,验之以基,其形露矣.文中“堑堵”是指底面是直角三角形,且侧棱垂直于底面的三棱柱;文中“阳马”是指底面为长方形且有一条侧棱与底面垂直的四棱锥;文中“鳖”是指四个面都是直角三角形的三棱锥.在堑堵
中,如图所示,若AC⊥BC,
,
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4281589e315201015790a60f75665992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/50e87c03-2793-4eef-83f9-420199dc2433.png?resizew=155)
A.四棱锥![]() |
B.三棱锥![]() |
C.点P在侧面![]() ![]() ![]() |
D.点N在侧棱![]() ![]() ![]() |
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