1 . 在长方体
中,
,
,
是线段
上的一动点,如下的四个命题中,
(1)
平面
;(2)
与平面
所成角的正切值的最大值是
;
(3)
的最小值
;(4)以
为球心,
为半径的球面与侧面
的交线长是
.
真命题共有几个( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.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/0d8772aa893a9c1d40f714cb25701701.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24579dca7ff1542ae019fc36110dddbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57132b0bd38c035fec010ee3be1bc8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138e0045398b0f40258ae51abe8b6f72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d63c1f30aa78aada181a0923b6c1c69e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b54387f870ae37f7951b253665d64f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
真命题共有几个( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
2 . 如图,在四棱锥P-ABCD中,平面
平面ABCD,
为等边三角形,
,
,M是棱上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/3db2c9c3-f4e2-4d68-8169-4fbc69e00e42.png?resizew=190)
(1)求证:
平面MBD;
(2)求二面角M-BD-C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d20fec32122b4a70b993976201c9ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e57d85dcecc700a41c1950733e45272.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/3db2c9c3-f4e2-4d68-8169-4fbc69e00e42.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f844a41f79ea2b231b326f8633beac50.png)
(2)求二面角M-BD-C的余弦值.
您最近一年使用:0次
2022-06-23更新
|
1772次组卷
|
6卷引用:江苏省南通市海安市立发中学2022-2023学年高三上学期学情检测(二)数学试题
江苏省南通市海安市立发中学2022-2023学年高三上学期学情检测(二)数学试题福建省福州格致中学2022-2023学年高二下学期期中考试数学试题辽宁省锦州市辽西育明高级中学2022-2023学年高二下学期期中数学试题青海省海东市第一中学2022届高考模拟(二)数学(理)试题(已下线)7.3 空间角(精讲)(已下线)7.5 空间向量求空间角(精讲)
3 . 如图,在四棱柱
中,点M是线段
上的一个动点,E,F分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/6/1/2992127515582464/2994891215503360/STEM/e434eaa7-6bfe-4b80-bb42-e88d8bc4e022.png?resizew=193)
(1)设G为棱
上的一点,问:当G在什么位置时,平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0ddf9cf1eeacb8e82b24a44621ea0d.png)
平面
?
(2)设三棱锥
的体积为
,四棱柱
的体积为
,求
.
![](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/2f7d420f403aa3db571e095220f0d65f.png)
![](https://img.xkw.com/dksih/QBM/2022/6/1/2992127515582464/2994891215503360/STEM/e434eaa7-6bfe-4b80-bb42-e88d8bc4e022.png?resizew=193)
(1)设G为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0ddf9cf1eeacb8e82b24a44621ea0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
(2)设三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7b603a64608e5b76215af4d3905c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
您最近一年使用:0次
2022-06-05更新
|
1368次组卷
|
7卷引用:江苏省无锡市天一中学2021-2022学年高一下学期期中数学试题
江苏省无锡市天一中学2021-2022学年高一下学期期中数学试题(已下线)2022年全国高考甲卷数学(文)试题变式题9-12题江西省景德镇一中2021-2022学年高一(19班)下学期期末考数学试题(已下线)专题30 直线、平面平行的判定与性质-3(已下线)2022年全国高考甲卷数学(文)试题变式题17-20题(已下线)第29讲 直线与平面平行河南省濮阳市第一高级中学2022-2023学年高一下学期5月月考数学试题
解题方法
4 . 如图
,
分别为线段
中点,且
三点不共线.求证:平面MNP//平面α
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d8836a1713907454069e8f8bc3e0a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9369aed2d8309af46ac3eaffb9cce537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c9bf316b03e8c4dabf63a5d7fb89fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9369aed2d8309af46ac3eaffb9cce537.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988543885172736/2989026641010688/STEM/c094f8e009c64b70be9c1173299e9841.png?resizew=273)
您最近一年使用:0次
名校
解题方法
5 . 如图1,在直角梯形
中,
,
,且
,现以
为一边向梯形外作正方形
,然后沿边
将正方形
翻折,使
,
为
的中点,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/050d4cd3-028b-4c5c-9870-411b996e5e47.png?resizew=381)
(1)求证:
平面
;
(2)求证:平面
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3da6e90f9c9617cd495abb57ab9b0e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/050d4cd3-028b-4c5c-9870-411b996e5e47.png?resizew=381)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39282bdf319f30d7bc261e2e3ab3b1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
2022-05-27更新
|
610次组卷
|
5卷引用:江苏省常州市八校2021-2022学年高二下学期5月联考数学试题
江苏省常州市八校2021-2022学年高二下学期5月联考数学试题湖南省长沙市长郡湘府中学2021-2022学年高一下学期期末模拟数学试题(已下线)8.6.3 平面与平面垂直(精练)(已下线)立体几何专题:折叠问题中的证明与计算5种题型四川省泸州市泸县泸县第四中学2022-2023学年高一下学期期末数学试题
6 . 在长方体
中,
,
,
是线段
上一动点,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978577357905920/2981276207677440/STEM/3f1f7571-94c7-4624-bf4c-e3a02d67a3bf.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.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/0d8772aa893a9c1d40f714cb25701701.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978577357905920/2981276207677440/STEM/3f1f7571-94c7-4624-bf4c-e3a02d67a3bf.png?resizew=190)
A.![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.三棱锥![]() ![]() |
您最近一年使用:0次
21-22高一下·江苏南通·期中
名校
解题方法
7 . 如图,在正方体
中,
分别为
,AB中点.
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980610696609792/2981280855351296/STEM/371f4d35-b257-4fdc-826f-d08e32ba8779.png?resizew=187)
(1)求证:
平面
;
(2)求异面直线EF与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980610696609792/2981280855351296/STEM/371f4d35-b257-4fdc-826f-d08e32ba8779.png?resizew=187)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
(2)求异面直线EF与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
您最近一年使用:0次
2022-05-17更新
|
1780次组卷
|
4卷引用:江苏省南通市如皋市2021-2022学年高一下学期教学质量调研(二)数学试题
(已下线)江苏省南通市如皋市2021-2022学年高一下学期教学质量调研(二)数学试题江苏省沐阳县修远中学2021-2022学年高一下学期教学质量调研数学试题(二)江苏省南京市金陵中学河西分校2022-2023学年高二上学期期初调研测试数学试题广西玉林市博白县中学2022-2023学年高一下学期4月联考数学试题
解题方法
8 . 如图1,在正方形
中,点
为线段
上的动点(不含端点),将
沿
翻折,使得二面角
为直二面角,得到图2所示的四棱锥
,点
为线段
上的动点(不含端点),则在四棱锥
中,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978577357905920/2981276207579136/STEM/dc2e09f5-b67a-4a20-9997-063e10e42daf.png?resizew=344)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e384e0ffc3d599303b77ee2a12221e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99be23ddbd80e2c75649e3d1f8594130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99be23ddbd80e2c75649e3d1f8594130.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978577357905920/2981276207579136/STEM/dc2e09f5-b67a-4a20-9997-063e10e42daf.png?resizew=344)
A.![]() ![]() ![]() ![]() |
B.存在点![]() ![]() ![]() |
C.侧面![]() ![]() ![]() |
D.三棱锥![]() |
您最近一年使用:0次
2022-05-17更新
|
967次组卷
|
4卷引用:江苏省徐州市铜山区2021-2022学年高二下学期期中数学试题
9 . 如图,在正方体
中,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978577357905920/2981276207775744/STEM/de8b329d-7a6c-4a9d-9245-15b637768cdb.png?resizew=177)
(1)求证:
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554b3b4c5ce7aca81becc07ed4903736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978577357905920/2981276207775744/STEM/de8b329d-7a6c-4a9d-9245-15b637768cdb.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eaa5e336f830a3e5cd60ff7a756f3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5ff76d62b0ce60fd66fce91b737515.png)
您最近一年使用:0次
解题方法
10 . 如图,在正三棱柱
中,AB=1,AA1=2,D,E分别是
的中点,则( )
![](https://img.xkw.com/dksih/QBM/2022/5/11/2976982874726400/2979071784779776/STEM/e640f777-3750-4ee3-8c42-c1e9a88d6bbd.png?resizew=114)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74373a614731cbf61af14e6e0dae21b.png)
![](https://img.xkw.com/dksih/QBM/2022/5/11/2976982874726400/2979071784779776/STEM/e640f777-3750-4ee3-8c42-c1e9a88d6bbd.png?resizew=114)
A.![]() | B.BE∥平面![]() |
C.![]() ![]() | D.![]() ![]() ![]() |
您最近一年使用:0次
2022-05-14更新
|
562次组卷
|
3卷引用:江苏省南通市2021-2022学年高二下学期期中数学试题