1 . 如图,在四棱锥
中,底面
是正方形,侧面
底面
,且
,设
,
,
分别为
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/27d6a2c9-2aa7-401b-94bb-dc632842c0e6.png?resizew=199)
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b7201f9eb7e7c10042c096e0c9f15c.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/27d6a2c9-2aa7-401b-94bb-dc632842c0e6.png?resizew=199)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1fd975b889bfe7ddcec0de56b6f23ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
2 . 如图甲所示,
是梯形
的高,
,
,
,先将梯形
沿
折起如图乙所示的四棱锥
,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/bfde3124-b971-4491-9a73-28a63263d43a.png?resizew=389)
(1)在棱
上是否存在一点
,使得
平面
?若存在,请求出
的值,若不存在,请说明理由;
(2)点
是线段
上一动点,当直线
与
所成的角最小时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ce06dbe9e1177468781ba4aff85ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd848c7f05fde2189f96808930f62d9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469bec78d9c4c484555b1c31b05101e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b744576b325f894cc71ffa1aa4d38b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9641d01140939c44450bf39773272af6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/bfde3124-b971-4491-9a73-28a63263d43a.png?resizew=389)
(1)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94270844f197d524bf1da4f1385befd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44cd09d9ad46264de4620c60370d49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e52b5625cff6fc8c5e150dd02a6e4b.png)
您最近一年使用:0次
名校
解题方法
3 . 如图,四棱锥
中,底面是边长为
的正方形ABCD,AC与BD的交点为O,
平面ABCD且
,E是边BC的中点,动点P在四棱锥表面上运动,并且总保持
,则动点P的轨迹的周长为
![](https://img.xkw.com/dksih/QBM/2020/2/20/2402983145603072/2403669436686337/STEM/4b7256295c004f1a93d0418479a31de3.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d30637da200a07672ae231b4c5c09cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0947f3c946b119851770fc6279de9be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://img.xkw.com/dksih/QBM/2020/2/20/2402983145603072/2403669436686337/STEM/4b7256295c004f1a93d0418479a31de3.png?resizew=148)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-02-21更新
|
1858次组卷
|
14卷引用:重庆市杨家坪中学2020-2021学年高二上学期半期数学试题
重庆市杨家坪中学2020-2021学年高二上学期半期数学试题(已下线)【南昌新东方】 江西省南昌三中2020-2021学年高二上学期10月第一次月考数学(理)试题(已下线)【新东方】【2020】【高二上】【期中】【HD-LP362】【数学】广东省汕头市澄海中学2020-2021学年高二上学期期中数学试题浙江省台州市第一中学2020-2021学年高二上学期期中数学试题安徽省蚌埠第三中学2020-2021学年高二上学期1月教学质量检测数学(理)试题北京市101中学2017-2018学年高一下学期期末数学试题河北省邯郸市永年区第一中学2019-2020学年高一下学期期末数学试题四川省成都七中2020-2021学年高三10月阶段性测试数学(理科)试题四川省成都七中2020-2021学年度高三10月阶段性测试数学(文科)试题(已下线)【新东方】杭州新东方高中数学试卷381(已下线)【新东方】杭州新东方高中数学试卷359(已下线)对点练47 直线、平面垂直的判定及其性质-2020-2021年新高考高中数学一轮复习对点练(已下线)专题24 立体几何中垂直的存在性问题-【重难点突破】2021-2022学年高一数学常考题专练(人教A版2019必修第二册)
4 . 如图,在四棱锥
中,
,底面ABCD是边长为3的正方形,E、F、G分别是棱AB、PB、PC的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/39e82a74-0307-418f-83b2-b98235dee163.png?resizew=292)
(Ⅰ)求证:平面EFG∥平面PAD;
(Ⅱ)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a4426db778693c875e2dca9220875d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19f0fcacac715a1200770516d1e4a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d0f60d9856f286e537788a99377590.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/39e82a74-0307-418f-83b2-b98235dee163.png?resizew=292)
(Ⅰ)求证:平面EFG∥平面PAD;
(Ⅱ)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ad0298c0f7878cb7c4dd7a141cd952.png)
您最近一年使用:0次
5 . 如图,在直四棱柱
中,底面四边形
为菱形,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/672f9842-81b2-4e71-aa0b-480a15869efc.png?resizew=548)
(1)图1中,点
是
的中点,求异面直线
所成角的余弦值;
(2)图2中,点
分别是
的中点,点
在线段
上,
,求证:平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72406478fda1c6e3b8052467385a3bc8.png)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/672f9842-81b2-4e71-aa0b-480a15869efc.png?resizew=548)
(1)图1中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebf42a849a1e6ffdc800203c3d01965.png)
(2)图2中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a808a3fb45f8a5c0f7c8b5c8505789e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7f389189bdc66ff44f44e23daa560.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e59d18af49ae962f94664d102a1d51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72406478fda1c6e3b8052467385a3bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd0b96e493a050ceafbb499c178f6a9.png)
您最近一年使用:0次
2017-12-14更新
|
395次组卷
|
2卷引用:重庆一中2017-2018学年高二上学期期中考试数学(理)试卷
6 . 在如图所示的几何体中,四边形
是正方形,
平面
,
,
、
、
分别为
、
、
的中点,且
.
(1)求证:平面
平面
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39967d6f3aed6ce7b6643787795d451d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/160ccfe256fc5347daa5e4cc26719512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792123541569536/1793761650565120/STEM/def06393be1f4c55bbd1193f7ef170ef.png?resizew=67)
(1)求证:平面
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792123541569536/1793761650565120/STEM/70d46e967bcd454b98e0731071c45bc9.png?resizew=49)
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792123541569536/1793761650565120/STEM/80946b964ddb41a983ca6b92f85930f8.png?resizew=37)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e0bd4b30dc777ac9da80f6baa3eb31.png)
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792123541569536/1793761650565120/STEM/52d9f6ae1a04420f85e2dee2fb7e45a6.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792123541569536/1793761650565120/STEM/a47a8c61-f935-40d9-b6c9-c59878cc4024.png)
您最近一年使用:0次
2017-10-12更新
|
973次组卷
|
5卷引用:重庆市彭水第一中学2017-2018学年高二上学期第一次月考数学(理)试题
7 . 如图所示的多面体中,四边形
是菱形、
是矩形,
面
,
.
![](https://img.xkw.com/dksih/QBM/2018/6/17/1969253939298304/2001732264640512/STEM/2bc02c24fc45494d8201d6e62651ec0a.png?resizew=217)
(1)求证:平面
平面
;
(2)若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a38e6c6dfde2b19b6b47f35a439a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb552b9e21dbaba74d11aa747790.png)
![](https://img.xkw.com/dksih/QBM/2018/6/17/1969253939298304/2001732264640512/STEM/2bc02c24fc45494d8201d6e62651ec0a.png?resizew=217)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c6944008168646d5f71fe3a930b0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307a23176550cded02f4e9a6e2ca014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48c65f7bcba6ef884d2884a9e7c1489.png)
您最近一年使用:0次
2016-12-03更新
|
4629次组卷
|
11卷引用:重庆市江津中学2020-2021学年高二上学期第二次阶段性考试数学试题
重庆市江津中学2020-2021学年高二上学期第二次阶段性考试数学试题(已下线)2013-2014学年广东省执信中学高二下学期期中文科数学试卷(已下线)2013-2014学年广东省梅州市重点中学高二下学期期中文科数学试卷新疆奎屯市第一高级中学2018-2019学年高二下学期第一次月考数学(文)试题(已下线)2014届广东省韶关市高三调研测试文科数学试卷(已下线)2015届广东省惠州市高三第一次调研考试文科数学试卷(已下线)2015届广东省揭阳一中、潮州金山中学高三上学期暑假联考文科数学试卷(已下线)2015届河南省名校高三上学期期中文科数学试卷广东省广州市海珠区2018届高三综合测试(一)数学文试题【全国省级联考】黑龙江省2018年普通高等学校招生全国统一考试仿真模拟(二)数学(文科)试题山东省滨州市邹平一中2018-2019学年高一下学期3月月考数学试题
8 . 如图,在四棱锥
中,
⊥平面
,
为
的中点,
为
的中点,底面
是菱形,对角线
,
交于点
.
![](https://img.xkw.com/dksih/QBM/2018/1/6/1854392185020416/1854707663921152/STEM/abcad1fa86ce46ae819d85a227f5d7cd.png?resizew=148)
求证:(1)平面
平面
;
(2)平面
⊥平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2018/1/6/1854392185020416/1854707663921152/STEM/abcad1fa86ce46ae819d85a227f5d7cd.png?resizew=148)
求证:(1)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35addbb24342de571443d84ab7c03d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
2016-12-02更新
|
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5卷引用:重庆市涪陵区涪陵高级中学校2019-2020学年高二上学期第一次诊断性考试数学试题
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