已知正方体
的棱长为
分别是棱
的中点,
是棱
上的动点(包括端点),则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2612d8c87010adfe87728a591b63e3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88eefaa74efafcea0c9f623190c3ddd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
A.![]() |
B.正方体的外接球的球心可能在平面![]() |
C.若直线![]() ![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() ![]() |
更新时间:2024-05-13 12:01:38
|
相似题推荐
多选题
|
适中
(0.65)
【推荐1】四面体
中,各棱长均为
,点
分别是
的中点,则下列向量的数量积等于
的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/e05ce7c9-8d30-4c5b-970b-236f76d67f56.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b199a99e53d67ff4abf233930961a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050bb02bd1f30dc038578b826c4503c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cc0b4997cae4d8aec791a1d3923314.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/e05ce7c9-8d30-4c5b-970b-236f76d67f56.png?resizew=190)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐2】已知MN是正方体内切球的一条直径,点
在正方体表面上运动,正方体的棱长是2,则
的取值可为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8eb37a4dd75318dcbd836395e575bd.png)
A.-1 | B.0 | C.![]() | D.5 |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐3】已知边长为
的正三角形
中,
为
中点,动点
在线段
上(不含端点),以
为折痕将
折起,使点
到达
的位置.记
,异面直线
与
所成角为
,则对于任意点
,下列成立的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/28001a40-be8d-420f-aa5b-d9df71875283.png?resizew=319)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa26fadeee2becc192fa53d778445d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/28001a40-be8d-420f-aa5b-d9df71875283.png?resizew=319)
A.![]() |
B.![]() |
C.存在点![]() ![]() |
D.存在点![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐1】下列说法正确的是( )
A.若G是四面体OABC的底面三角形ABC的重心,则![]() |
B.在四面体OABC中,若![]() |
C.已知平行六面体![]() ![]() ![]() ![]() |
D.若向量![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
解题方法
【推荐2】若l1,l2,l3是三条互相平行的直线,l1与l2之间距离为1,l1与l3之间距离为1,l2与l3之间距离为
,A,B是直线l1上的点,且
,C,D分别是直线l2,l3上的点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
A.![]() | B.![]() ![]() |
C.三棱锥![]() ![]() | D.![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
解题方法
【推荐1】如图所示,棱长为1的正方体
中,点
为线段
上的动点(不含端点),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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/18/256d8a46-59cc-48d3-b345-f84a2efee8d8.png?resizew=159)
A.平面![]() ![]() |
B.三棱锥![]() ![]() |
C.![]() |
D.![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐2】已知
,
,
,下列关于空间向量的命题中,正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e65b30848ecf29410cb13f932da4daa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eccb232c4ce57581f8ae2973201cfcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db48d240ff966db839fa7301ef429f3e.png)
A.若![]() ![]() ![]() ![]() |
B.以![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐1】正方体
中,E、F、G、H分别为
、BC、CD、
的中点,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/3/15/2420101377908736/2420286422917120/STEM/a3f08f52496e407894bcb9fbe39bcf18.png?resizew=189)
![](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/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/2020/3/15/2420101377908736/2420286422917120/STEM/a3f08f52496e407894bcb9fbe39bcf18.png?resizew=189)
A.![]() | B.平面![]() ![]() |
C.![]() | D.二面角![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐2】如图,在正方体
中,
,点M,N分别在棱AB和
上运动(不含端点),若
,下列命题正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/b4806f86-0d29-4d7d-a287-b4befd20530d.png?resizew=182)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3919ec9499b0ee102c84de7af74302da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/b4806f86-0d29-4d7d-a287-b4befd20530d.png?resizew=182)
A.![]() |
B.![]() ![]() |
C.线段BN长度的最大值为![]() |
D.当点M,N分别在棱AB和![]() ![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐3】某酒店大堂的壁灯的外观是将两个正三棱锥的底面重合构成的一个六面体(如图),已知
,现已知三棱锥
的高大于三棱锥
的高,则( )
![](https://img.xkw.com/dksih/QBM/2022/5/22/2984783542059008/2986137767174144/STEM/eb677eeae614415e8d23e2670687eb7c.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8901560f35f7278c84e5bbc000f5f47b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42020cfacd62b300cad053981bab9e0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/22/2984783542059008/2986137767174144/STEM/eb677eeae614415e8d23e2670687eb7c.png?resizew=123)
A.![]() ![]() |
B.二面角![]() ![]() |
C.该六面体存在外接球 |
D.该六面体存在内切球 |
您最近一年使用:0次