如图,在正方体
中,E为棱
的中点.动点P沿着棱
从点D向点C移动,对于下列四个结论中正确的个数是( )
;
(2)存在点P,使得
平面
;
(3)
的面积越来越小;
(4)四面体
的体积不变.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656aceec19543470bd58ed3d304d155d.png)
(2)存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4645450a006f2c20087486d0833afbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1e007fb94902451b22b4e15fe06b08.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1b7f8c6e4793af4336d02addfbfbb.png)
(4)四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6738d05f0c7e4f0076fd5c094a4fb51c.png)
A.0 | B.1 | C.2 | D.3 |
23-24高二上·上海·期末 查看更多[2]
上海市北虹高级中学2023-2024学年高二上学期期末数学试题(已下线)专题07 空间向量与立体几何(九大题型+优选提升题)-【好题汇编】备战2023-2024学年高二数学下学期期末真题分类汇编(沪教版2020选择性必修,上海专用)
更新时间:2024-01-15 07:28:10
|
【知识点】 空间位置关系的向量证明
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【推荐1】正方体
的棱长为3,点E,F分别在棱
上,且
,
,下列几个命题:
①异面直线
与
垂直;
②过点B,E,F的平面截正方体,截面为等腰梯形;
③三棱锥
的体积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
④过点
作平面
,使得
,则平面
截正方体所得的截面面积为
.
其中真命题的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca280e104ed71b4bf4646c8845df6a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1916d2aa3b9a7d351c6389ed75cbd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9f6d0396928eb0154373244c9aae74.png)
①异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
②过点B,E,F的平面截正方体,截面为等腰梯形;
③三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5a44046c8232c8b81924036c6ba9ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
④过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c297eb80dce2764c2ba045fdee42bab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a042179f50ab26493ce2505fa898c35d.png)
其中真命题的序号为( )
A.①④ | B.①③④ | C.①②③ | D.①②③④ |
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【推荐2】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![]() ![]() ![]() |
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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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