1 . 已知正方体
的棱
、
、
、
的中点分别为
、
、
、
,则下列直线中,与两平面
、
交线平行的一条直线是( )
![](https://img.xkw.com/dksih/QBM/2022/9/4/3059199429361664/3064047427248128/STEM/ff46330324444fe897708ee2b6f615e2.png?resizew=175)
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbafedc202bd0d86c4dfdece9f8f4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab35850dbc661ded6456b70767cc6cd0.png)
![](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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
![](https://img.xkw.com/dksih/QBM/2022/9/4/3059199429361664/3064047427248128/STEM/ff46330324444fe897708ee2b6f615e2.png?resizew=175)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 如图,一个侧棱长为
的直三棱柱
容器中盛有液体(不计容器厚度).若液面恰好分别过棱
中点
.
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/e1eb5a88-86ff-4a9f-8bb4-525a37576c9a.png?resizew=313)
(1)求证:平面
平面
;
(2)当底面
水平放置时,求液面的高.
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/46fb9827ad0b48e98fab79d4435106b3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/1ef473af9ace4ee5914c1ad653b1190d.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/f9fef578d65543a493d74b8b38faa2ad.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/9b546ad887a647a5a34018c9d2ed785c.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/e1eb5a88-86ff-4a9f-8bb4-525a37576c9a.png?resizew=313)
(1)求证:平面
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/9895a5b316df4c11a2384b163ef62e11.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/0b681df5a0d740dda6fe7c46782ca554.png)
(2)当底面
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573076038017024/1573076043431936/STEM/e4744a1d369b463ea1649b21ec16baba.png)
您最近一年使用:0次
3 . 在如图所示的空间几何体中,平面
平面
,
与
是边长为
的等边三角形,
,
和平面
所成的角为
,且点
在平面
上的射影落在
的平分线上.
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/983a7bbd82d246258d820d2cf6155367.png)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/3b46f3c75aa847a3940791f0f6578f0d.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/7ab0623173af482695cf318b90a0ea83.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/09070f2461fc48b192826660ad167cbd.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/5ec8756f1a9a4d19a7d72270b0c4be54.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/a6e1671439f64fbf9bef202e2ab9a471.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/9a9413c6fa264733b3518928509a5b0c.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/a6a0081bf66e40b1a399df82b29e2ab6.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/7ab0623173af482695cf318b90a0ea83.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/1d9d8b5244864ee3a89faac301b22602.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/e49aebcd926b492f93f9b64adc526b0d.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/7ab0623173af482695cf318b90a0ea83.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/a8282077fd614507905a5ddee3fc60ce.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/983a7bbd82d246258d820d2cf6155367.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/52815a849f81458e83e0f709d49d7fc2.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/7ab0623173af482695cf318b90a0ea83.png)
(2)求二面角
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572507975041024/1572507981225984/STEM/687d85108a63415482fac84ee2699e4d.png)
您最近一年使用:0次
2016-12-04更新
|
437次组卷
|
3卷引用:2015届江西高安中学高三命题中心模拟三理科数学试卷
4 . 设
为空间两条不同的直线,
为空间两个不同的平面,给出下列命题:
①若
,则
;
②若
,则
;
③若
,则
;
④若
,则
.
其中的正确命题序号是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1c8146d084248c9c65dd8a11801905.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145a69c90de6b2e87a1fd153f48b983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d966f5de8a202970f319a205ac3443.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1de9a75e02fbba70553c84ddf1432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59125d06d7a90bf51db555a988025c34.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3d0c081357a73b39cc26410d966e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e91e7a3b0e2708782def67d197589b9.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3644955a6bf86e37c90d7db28f762a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95938408acc91db121ccf810a43f1c8f.png)
其中的正确命题序号是
A.③④ | B.②④ | C.①② | D.①③ |
您最近一年使用:0次
5 . 如图,四边形ABCD是梯形,四边形CDEF是矩形,且平面ABCD⊥平面CDEF,
∠BAD=∠CDA=90°,
,M是线段AE上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/448f90b4-6d72-4e4f-ab7c-b3c7048c9811.png?resizew=195)
(1)试确定点M的位置,使AC∥ 平面DMF,并说明理由;
(2)在(1)的条件下,求平面DMF与平面ABCD所成锐二面角的余弦值.
∠BAD=∠CDA=90°,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601ad0321eb89587c3bc5504226d7bb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/448f90b4-6d72-4e4f-ab7c-b3c7048c9811.png?resizew=195)
(1)试确定点M的位置,使AC∥ 平面DMF,并说明理由;
(2)在(1)的条件下,求平面DMF与平面ABCD所成锐二面角的余弦值.
您最近一年使用:0次
6 . 如图,在四棱柱
中,侧面
⊥底面
,
,底面
为直角梯形,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44bcd34c14a1300d5827573f2fa30b7.png)
,O为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/cdb2c213-d69f-45a7-bb3a-b21c12275e48.png?resizew=244)
(Ⅰ)求证:
平面
;
(Ⅱ)求锐二面角A—C1D1—C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d540455054b9781297a1e871949be43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44bcd34c14a1300d5827573f2fa30b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a93f5289c1483bc39b0125fdc8dd67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/cdb2c213-d69f-45a7-bb3a-b21c12275e48.png?resizew=244)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6dcab5d5bdeb695b261e21c8491039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
(Ⅱ)求锐二面角A—C1D1—C的余弦值.
您最近一年使用:0次
2016-12-01更新
|
1196次组卷
|
8卷引用:2011届江西省宜春市高三模拟考试数学理卷
(已下线)2011届江西省宜春市高三模拟考试数学理卷(已下线)2012届山东省济南一中高三上学期期末理科数学试卷(已下线)2012届河南省卢氏一高高三上学期期末调研考试理科数学试卷2015届湖北省襄阳市第五中学高三第一学期11月质检理科数学试卷2016届山东省枣庄八中高三12月月考理科数学试卷2016-2017学年河北冀州中学高二理上期中考试数学卷2017届广东顺德李兆基中学高三理上月考二数学试卷广西南宁市第二中学2019-2020学年高二上学期期中考试(理)数学试题