1 . 点
、
、
分别是正方体
的棱
,
,
的中点,则下列命题中的真命题是__________ (写出所有真命题的序号).
①以正方体的顶点为顶点的三棱锥的四个面中最多可以四个面都是直角三角形;
②点
在直线
上运动时,总有
;
③点
在直线
上运动时,三棱锥
的体积是定值;
④若
是正方体的面
,(含边界)内一动点,且点
到点
和
的距离相等,则点
的轨迹是一条线段.
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
①以正方体的顶点为顶点的三棱锥的四个面中最多可以四个面都是直角三角形;
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e32cf73c01995c91c3523fa11b3bd7d.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d8b73e5f21858fd4caabf9c086d0bbb.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
2020-02-16更新
|
160次组卷
|
2卷引用:湖北省武汉市(第十五中学、十七中学、常青一中)2019-2020学年高二上学期期末数学试题
2 . 在长方体
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe38b985695aa1c032fd7b2ef88a8b64.png)
,E,F,P,Q分别为棱![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfd2cfa70c66adb6440ed5f627b12ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc307ea75bec1d37efce66ab8e1e719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff506ec404de582145f1d4c1c65e65dc.png)
的中点,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/fe38b985695aa1c032fd7b2ef88a8b64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db57eca2a7cbd91bc57372592580a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfd2cfa70c66adb6440ed5f627b12ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc307ea75bec1d37efce66ab8e1e719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff506ec404de582145f1d4c1c65e65dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
A.![]() | B.![]() |
C.![]() | D.直线![]() ![]() ![]() |
您最近一年使用:0次
2020-01-31更新
|
704次组卷
|
8卷引用:山东省烟台市2019-2020学年高二上学期期末数学试题
名校
3 . 如图,矩形
中,
,
为边
的中点,沿
将
折起,点
折至
处(![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
平面
),若
为线段
的中点,则在
折起过程中,下列说法错误的是( )
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378575661563904/2380314942234624/STEM/aa01528d2dd64878a3bfee71b6ad03a8.png?resizew=210)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5203b16524b496a7272b5735aad23ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/e581739cffb5676d997a58ab10d58880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378575661563904/2380314942234624/STEM/aa01528d2dd64878a3bfee71b6ad03a8.png?resizew=210)
A.始终有![]() ![]() |
B.不存在某个位置,使得![]() ![]() ![]() |
C.三棱锥![]() ![]() |
D.一定存在某个位置,使得异面直线![]() ![]() ![]() |
您最近一年使用:0次
2020-01-25更新
|
1184次组卷
|
7卷引用:湖北省恩施州清江外国语学校2019-2020学年高二上学期期末数学试题
湖北省恩施州清江外国语学校2019-2020学年高二上学期期末数学试题云南省玉溪市第一中学2019-2020学年高三上学期12月月考数学(理)试题(已下线)2020届高三12月第02期(考点07)(理科)-《新题速递·数学》(已下线)专题02 从空间到平面,助力破解立体几何问题 (第四篇)-2020高考数学压轴题命题区间探究与突破安徽省淮北市第一中学2020届高三下学期最后一卷数学(理)试题(已下线)专题4.5 立体几何中探索性问题-玩转压轴题,进军满分之2021高考数学选择题填空题(已下线)考点突破08 立体几何初步-备战2022年高考数学一轮复习培优提升精炼(新高考地区专用)
名校
4 . 在Rt△ABC中,∠B=90°,BC=6,AB=8,点M为△ABC内切圆的圆心,过点M作动直线l与线段AB,AC都相交,将△ABC沿动直线l翻折,使翻折后的点A在平面BCM上的射影P落在直线BC上,点A在直线l上的射影为Q,则
的最小值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7174a0ee5b91f0975cf4433217d164.png)
您最近一年使用:0次
2020-01-24更新
|
1112次组卷
|
5卷引用:广西玉林市田家炳中学2020-2021学年高二上学期质量检测数学试题
广西玉林市田家炳中学2020-2021学年高二上学期质量检测数学试题湖北省武汉市第一中学2021-2022学年高二上学期第一次月考数学试题河南省名校鹤壁高中2019届高三压轴第二次考试数学(理科)试题安徽省滁州市部分高中2018-2019学年高一下学期期末数学试题(已下线)第二章 立体几何中的计算 专题七 空间范围与最值问题 微点2 线段、距离、周长的范围与最值问题(二)【基础版】
5 . 如图,在三棱柱
中,
,底面为正三角形,
,D是BC的中点,P是
的中点.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/5b9c3d48-2d88-42ad-91a8-252d8cbf26cd.png?resizew=124)
(1)
平面
;
(2)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc61a2aa5d8aebe6773d235f31ed81f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/5b9c3d48-2d88-42ad-91a8-252d8cbf26cd.png?resizew=124)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c823e54bf3a3a7f1916a4886eb6279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
您最近一年使用:0次
2020-01-14更新
|
201次组卷
|
3卷引用:湖北省恩施州利川市第五中学2020-2021学年高二上学期期中数学试题
6 . 如图,长方体ABCD﹣A1B1C1D1中,AB=AD=1,AA1=2,点P为DD1的中点,点M为BB1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/9eb15769-6e3d-49e1-a01a-b740de22e6ee.png?resizew=130)
(1)求证:PB1⊥平面PAC;
(2)求直线CM与平面PAC所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/9eb15769-6e3d-49e1-a01a-b740de22e6ee.png?resizew=130)
(1)求证:PB1⊥平面PAC;
(2)求直线CM与平面PAC所成角的正弦值.
您最近一年使用:0次
2020-01-11更新
|
252次组卷
|
3卷引用:湖北省黄石市2018-2019学年高二上学期期末质量监测考试数学(理)试题
7 . 如图,在四棱锥P﹣ABCD中,底面ABCD是边长为1的正方形,PB⊥BC,PD⊥DC,且PC
.
![](https://img.xkw.com/dksih/QBM/2020/1/7/2372104037834752/2372556444737536/STEM/52ab1d07f1e24a7f871d2103b1391cf8.png?resizew=260)
(1)求证:PA⊥平面ABCD;
(2)求异面直线AC与PD所成角的余弦值;
(3)求二面角B﹣PD﹣C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada26e9b7fe22be819d675f72e086ee.png)
![](https://img.xkw.com/dksih/QBM/2020/1/7/2372104037834752/2372556444737536/STEM/52ab1d07f1e24a7f871d2103b1391cf8.png?resizew=260)
(1)求证:PA⊥平面ABCD;
(2)求异面直线AC与PD所成角的余弦值;
(3)求二面角B﹣PD﹣C的余弦值.
您最近一年使用:0次
8 . 已知
,
是两条不同的直线,
,
是两个不同的平面,给出下列命题:
①若
,
,
,则
;②若
,
,则
;③若
,
是异面直线,则存在
,
,使
,
,且
;④若
,
不垂直,则不存在
,使
.
其中正确的命题有.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de666db0febae223cc4d1dc189d71ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539a38ada26356d73024fb8533449c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209323a7a4d015f7e570ec578c1731f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0258342fb0eff42b5d37cbe42b6c89b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34512482dc6ca8f32d80e4b37d64086b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0258342fb0eff42b5d37cbe42b6c89b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73552465f894573a9147f9a81779b5be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539a38ada26356d73024fb8533449c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209323a7a4d015f7e570ec578c1731f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de666db0febae223cc4d1dc189d71ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539a38ada26356d73024fb8533449c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b610e3c5b3d78a5730e7f3d736ac28.png)
其中正确的命题有.
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
2019-12-12更新
|
834次组卷
|
7卷引用:湖北省恩施州高中教育联盟2019-2020学年高二上学期期中考试数学试题
湖北省恩施州高中教育联盟2019-2020学年高二上学期期中考试数学试题安徽省合肥市庐阳区第一中学2019-2020学年高二上学期期末数学(理)试题安徽省阜阳市太和第一中学2020-2021学年高二(平行班)上学期开学考试数学试题安徽省合肥市第一中学2019-2020学年高二上学期期末理科数学试题(已下线)考点31 直线、平面平行的判定及其性质-备战2021年高考数学(理)一轮复习考点一遍过(已下线)考点30 直线、平面平行的判定及其性质-备战2021年高考数学(文)一轮复习考点一遍过甘肃省武威第一中学2021-2022学年高三上学期开学考试文科数学试题
9 . 如图,四棱锥
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/3964c2f9-7b75-4437-83b6-5256b9514bda.png?resizew=199)
(1)求证:
平面
;
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9191b58361e02cdf8bdfa823e58ff883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10850327c490a6535ad87419de71c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/3964c2f9-7b75-4437-83b6-5256b9514bda.png?resizew=199)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
您最近一年使用:0次
2019-12-12更新
|
517次组卷
|
4卷引用:湖北省鄂东南省级示范高中教育教学改革联盟学校2019-2020学年高二上学期期中联考数学试题
名校
解题方法
10 . 如图,在三棱锥
中,平面
平面
,
,
,
,
,
分别为线段
,
上的点,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/de9dc801-32aa-452c-982f-3e5a538648d3.png?resizew=137)
(1)求证:
平面
;
(2)若直线
与平面
所成的角为
,求平面
与平面
所成的锐二面角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9538281f10aa8129a3d0cc49a0370db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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9卷引用:湖北省黄石市2019-2020学年高二上学期期末数学试题
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