如图,正方体
的棱长为2,设P是棱
的中点,Q是线段
上的动点(含端点),M是正方形
内(含边界)的动点,且
平面
,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/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c407eeb34204a1df967b8fbe481cb04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98dbbf1a30ea54a46b903a9645debab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714ae984b13488d536f583f610e59945.png)
A.存在满足条件的点M,使![]() |
B.当点Q在线段![]() ![]() |
C.三棱锥![]() |
D.直线![]() ![]() ![]() |
更新时间:2024-05-23 18:09:37
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【推荐1】如图,在棱长为1的正方体
中,点P在线段
运动,点Q在线段
运动,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
A.对任意的点P,有![]() |
B.存在直线PQ,使![]() |
C.PQ的最小值为![]() |
D.过点P可以作4条直线与![]() ![]() ![]() |
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【推荐2】在菱形
中,
,
,将菱形
沿对角线
折成大小为
的二面角
,若折成的四面体
内接于球
,则下列说法正确的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecf80448f3ea9f6481e10781126f9c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c909cd1b6f3fa1ec39eb245e8f5c11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.四面体![]() ![]() |
B.![]() ![]() |
C.四面体![]() ![]() |
D.当![]() ![]() ![]() |
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【推荐1】在四面体
中,
,四面体
的顶点均在球
的表面上,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e677be79bc6d0d98e10f8635f914d1af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.当二面角![]() ![]() ![]() | B.球![]() |
C.异面直线![]() ![]() | D.![]() ![]() ![]() |
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【推荐2】已知等边三角形ABC的边长为6,M,N分别为AB,AC的中点,如图所示,将△AMN沿MN折起至
,得到四棱锥
,则在四棱锥
中,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967325653811200/2972044326862848/STEM/0bf8104125fa4fb29406eff9087d9e44.png?resizew=305)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e7040c2fd8a163d71e35805775feb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25c1f004fbf481518e0c14bf1bda6b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25c1f004fbf481518e0c14bf1bda6b3.png)
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967325653811200/2972044326862848/STEM/0bf8104125fa4fb29406eff9087d9e44.png?resizew=305)
A.当四棱锥![]() ![]() |
B.在折起过程中,存在某位置使BN⊥平面![]() |
C.当四棱锥![]() ![]() ![]() |
D.当二面角![]() ![]() ![]() |
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【推荐3】“阿基米德多面体”也称为半正多面体,是由边数不全相同的正多边形为面围成的多面体,它体现了数学的对称美.如图,将正方体沿交于一顶点的三条棱的中点截去一个三棱锥,共截去八个三棱锥,得到的半正多面体的表面积为
,则关于该半正多面体的下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/12401610-f2fa-4097-8f4f-19df0aab0dcf.png?resizew=177)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2c06207565e9fa6a288a788e4ab2fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/12401610-f2fa-4097-8f4f-19df0aab0dcf.png?resizew=177)
A.与AB所成的角是60°的棱共有8条 |
B.AB与平面BCD所成的角为30° |
C.二面角![]() ![]() |
D.经过A,B,C,D四个顶点的球面面积为![]() |
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【推荐1】如图,四边形
是圆柱
的轴截面且面积为2,四边形
绕
逆时针旋转
到四边形
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2aa1860aa83677493206e12d21ca6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1778ddb94218677eea15aee36dff627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43af096355a1e284e84a9dfb424661bc.png)
A.圆柱![]() ![]() |
B.当![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() |
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【推荐2】如图1,在菱形ABCD中,
,
,将
沿AC折起,使点B到达点P的位置,形成三棱锥
,如图2.在翻折的过程中,下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/1273fe8f-dd95-49e3-b6b8-ef57dc2af275.png?resizew=324)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/1273fe8f-dd95-49e3-b6b8-ef57dc2af275.png?resizew=324)
A.![]() |
B.三棱锥![]() |
C.存在某个位置,使![]() |
D.若平面![]() ![]() |
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【推荐1】正四棱锥
中,各棱长均为1,
过点M,N,Q的平面交PD于点S,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d63599dde9c916906138294b26e39c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4648a19cafbfff36232bdbc870c7961f.png)
A.![]() |
B.点S到平面PMQ的距离为![]() |
C.平面MNQ与平面ABCD夹角的余弦值为![]() |
D.两个四棱锥![]() ![]() ![]() |
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【推荐2】如图,正方体
的棱长为2,线段
上有两个动点E,F(E在F的左边),且
.则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6469878a955cc09fac22ba5aea3fb962.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/60e1f414-7e88-44a7-8101-5db44754cc8e.png?resizew=174)
A.当E,F运动时,不存在点E,F使得![]() |
B.当E,F运动时,不存在点E,F使得![]() |
C.当E运动时,二面角![]() |
D.当E,F运动时,直线![]() ![]() |
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