已知正四棱柱
中,
,
,点
、
分别是棱
、
上的动点,则下列判断错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.任意给定的点![]() ![]() ![]() ![]() |
B.任意给定的点![]() ![]() ![]() ![]() |
C.任意给定的点![]() ![]() ![]() |
D.任意给定的点![]() ![]() ![]() |
更新时间:2022-07-22 08:36:10
|
相似题推荐
单选题
|
较难
(0.4)
名校
解题方法
【推荐1】如图,点P在正方体
的面对角线
上运动(P点异于B,
点),则下列四个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7384ad9e-5bda-47f9-9df6-89ca89a1186c.png?resizew=147)
①三棱锥
的体积不变;
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
平面
;
③
;
④平面
平面
.
其中正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7384ad9e-5bda-47f9-9df6-89ca89a1186c.png?resizew=147)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad99ef5e70de37345c708b758d545f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d738aec61fee6269dbf8fc9fbd09c276.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb955df71b56b325021d2552303285f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
其中正确结论的个数是( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,矩形ABCD中,AB=2AD=2,E为边AB的中点,将△ADE沿直线DE翻折成△
DE,使平面
DE⊥平面BCDE,若M为线段
C的中点,下面四个命题中不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/b8237c68-db99-4a6b-86a3-37301bf000c6.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/b8237c68-db99-4a6b-86a3-37301bf000c6.png?resizew=176)
A.BM![]() ![]() | B.CE⊥平面![]() |
C.DE![]() | D.平面![]() ![]() |
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解题方法
【推荐1】已知三棱锥
的所有棱长均为2,
为
的中点,空间中的动点
满足
,
,则动点
的轨迹长度为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f138877b595987abf3397aab8f9895e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知正方体
的棱长为4,M,N分别是侧面
和侧面
的中心,过点M的平面
与直线ND垂直,平面
截正方体
所得的截面记为S,则S的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
【推荐1】如图,若P是棱长为2的正方体
的表面上一个动点,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.当P在平面![]() ![]() |
B.当P在线段![]() ![]() ![]() ![]() |
C.使直线![]() ![]() ![]() |
D.若F是棱![]() ![]() ![]() ![]() ![]() ![]() |
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【推荐2】如图,在棱长为2的正方体
中,
为棱
的中点,
分别是底面
与侧面
的中心,
为该正方体表面上的一个动点,且满足
,记点
的轨迹所在的平面为
,则过
四点的球面被平面
截得的圆的周长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/55b92afe-4be3-4519-8562-0168bb0c5ad7.png?resizew=172)
![](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/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5639ef03056c2a67e9c48069155ffd3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86deb904c5c7baa3b33def0c4f778d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/55b92afe-4be3-4519-8562-0168bb0c5ad7.png?resizew=172)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐3】如图,在棱长为1的正方体
中,P为棱
的中点,Q为正方形
内一动点(含边界),则下列说法中不正确 的是( )
![](https://img.xkw.com/dksih/QBM/2022/10/7/3082428759613440/3082833397030912/STEM/4d8efa58d1de47fe8ad6aaeef5805373.png?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72545bef56c4e32d1b76489bd32c3842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86814dbae9a5343d69bb4647900b3bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5e9bf7536a8512ef10452ab5dda5be.png)
![](https://img.xkw.com/dksih/QBM/2022/10/7/3082428759613440/3082833397030912/STEM/4d8efa58d1de47fe8ad6aaeef5805373.png?resizew=189)
A.若![]() ![]() |
B.存在Q点,使得![]() ![]() |
C.当且仅当Q点落在棱![]() ![]() |
D.若![]() ![]() |
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