1 . 如图,在四棱锥
中,已知
平面
,
为等边三角形,
,
,
与平面
所成角的正切值为
.
![](https://img.xkw.com/dksih/QBM/2019/5/19/2207077926076416/2207212498403328/STEM/702a1c2e4e23408e87113db6784a2901.png?resizew=151)
(Ⅰ)证明:
平面
;
(Ⅱ)若
是
的中点,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5019d74a9497f861a0f755ea31d010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf10d92f20501e19d25f6f4159aab89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://img.xkw.com/dksih/QBM/2019/5/19/2207077926076416/2207212498403328/STEM/702a1c2e4e23408e87113db6784a2901.png?resizew=151)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4725c54bc7cfaf65d0279ea39cc42a9.png)
您最近一年使用:0次
2019-05-19更新
|
1545次组卷
|
2卷引用:广西壮族自治区田阳高中2019-2020学年高二上学期12月月考数学(理)试题
2 . 如图,在四棱锥
中,
平面
,
,
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/88b41ee0-894c-4045-aa22-87a0578cc4d1.png?resizew=134)
(1)求证:
平面
;
(2)线段
上是否存在一点
,满足
?若存在,试求出二面角
的余弦值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430b77d8d2a99713b192dc729ddc2275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559470787fd107b8781b8be7e831535d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/88b41ee0-894c-4045-aa22-87a0578cc4d1.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb5255e2159617505e0c87d01437a57.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9637000a187c45183791bfc6ee7789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d738d9374fb6e9284e6a58afc532cb6.png)
您最近一年使用:0次
2020-01-19更新
|
210次组卷
|
8卷引用:广西壮族自治区南宁市第三中学2019-2020学年高二上学期10月月考数学(理)试题
广西壮族自治区南宁市第三中学2019-2020学年高二上学期10月月考数学(理)试题2016届湖北七市教研协作体高三4月联考试数学(理)试卷广东省六校联盟2019-2020学年高三上学期第一次联考数学(理)试题江西省宜春市上高县上高二中2019-2020学年高二上学期第三次月考数学(理)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)试题贵州省仁怀市第四中学2023-2024学年高二上学期第一次月考数学试题(已下线)2020届高三12月第02期(考点07)(理科)-《新题速递·数学》江西省宜春中学、高安二中、上高二中、樟树中学、丰城中学2021届高三上学期五校联考数学(理)试题
名校
3 . 如图,四边形ABCD是正方形,PA
平面ABCD,EB//PA,AB=PA=4,EB=2,F为PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/05d2699d-9668-4853-b279-7cfb88a0c0b5.png?resizew=158)
(1)求证AF
PC
(2)BD//平面PEC
(3)求二面角D-PC-E的大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/05d2699d-9668-4853-b279-7cfb88a0c0b5.png?resizew=158)
(1)求证AF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)BD//平面PEC
(3)求二面角D-PC-E的大小
您最近一年使用:0次
2019-01-15更新
|
528次组卷
|
7卷引用:广西壮族自治区田阳高中2018-2019学年高二12月月考数学(理)试题
4 . 在三棱柱
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce3cec96c4e1314eca67595920d726e.png)
,
,
是线段
上的中点.
![](https://img.xkw.com/dksih/QBM/2018/8/14/2010129394106368/2012968273346560/STEM/f5eadc7aad114e2e9016231639e84a4a.png?resizew=163)
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
(2)求直线
与平面
所成角的正弦值.
![](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/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce3cec96c4e1314eca67595920d726e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2018/8/14/2010129394106368/2012968273346560/STEM/f5eadc7aad114e2e9016231639e84a4a.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4557a368725226f2c8ea2efb7d30e478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
您最近一年使用:0次
5 . 已知在三棱锥
中,
底面
,
,
,
是
的中点,
是线段
上的一点,且
,连接
.
(l)求证:
平面
;
(2)求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ca19321c6776be24e4be5033b60ed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bd02e0adeae92ba9526261b1baf797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb241abc97d26f1c693c53acb7c64cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62eccb33ea66c03222468628f74d8c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f985e4df8bc1111f5aa9646ac790fa9.png)
(l)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c758c48f871cf8f91892366e4e242d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://img.xkw.com/dksih/QBM/2018/5/28/1955009781178368/1958137931513856/STEM/9f80424d57174edbb5323483b3094bd5.png?resizew=197)
您最近一年使用:0次
6 . 如图,在四棱锥P-ABCD中,底面ABCD是正方形,侧棱PD⊥底面ABCD,PD=DC,E是PC的中点,
![](https://img.xkw.com/dksih/QBM/2018/4/3/1916007509835776/1917063704543232/STEM/88fcf157ab24438b929bb9fc9a75316f.png?resizew=187)
(1)证明:PA∥平面EDB
(2)证明:平面BDE
平面PCB
![](https://img.xkw.com/dksih/QBM/2018/4/3/1916007509835776/1917063704543232/STEM/88fcf157ab24438b929bb9fc9a75316f.png?resizew=187)
(1)证明:PA∥平面EDB
(2)证明:平面BDE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
您最近一年使用:0次
2018-04-04更新
|
454次组卷
|
2卷引用:广西桂梧高中2017-2018学年高一下学期第一次月考数学(B)试卷
7 . 如图,四棱柱ABCD-A1B1C1D1中,CD∥AB, AB⊥BC,AB=BC=2CD=2,侧棱AA1⊥平面ABCD.且点M是AB1的中点
(1)证明:CM∥平面ADD1A1;
(2)求点M到平面ADD1A1的距离.
(1)证明:CM∥平面ADD1A1;
(2)求点M到平面ADD1A1的距离.
![](https://img.xkw.com/dksih/QBM/2018/4/9/1920387391283200/1921336520581120/STEM/a3f7f0d0ad19428aa61241b9fb145aaa.png?resizew=209)
您最近一年使用:0次
2018-03-23更新
|
394次组卷
|
2卷引用:广西陆川县中学2018届高三3月月考数学(文)试题
8 . 如图,平行四边形
中,
=
=
,现将
沿
折起,得到三棱锥
,且
,点
为侧棱
的中点.
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967883688271872/1968989226991616/STEM/1fb98038-5a8b-44ea-bcfd-b71d089e78ae.png?resizew=554)
(1)求证:
平面
;
(2)求三棱锥
的体积;
(3)在
的角平分线上是否存在一点
,使得
平面
?若存在,求
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e2ccb1971ebca643868a38670481ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62d52be7c6e607972b4cf8ccbf58436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967883688271872/1968989226991616/STEM/1fb98038-5a8b-44ea-bcfd-b71d089e78ae.png?resizew=554)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d3f5f4c4419913c1232b7aae03ade.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdf5722d12acce3684aa5c6e2f7de65.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f44f2b2f82a9126223138972850aa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
2018-06-17更新
|
687次组卷
|
14卷引用:广西钦州市第四中学2020-2021学年高一(体艺班)3月份考试数学试题
广西钦州市第四中学2020-2021学年高一(体艺班)3月份考试数学试题江西省南昌市第二中学2016-2017学年高二下学期第三次月考数学(文)试题四川省广安市广安代市中学校2021-2022学年高二11月月考数学(文)试题江西省宜春市铜鼓中学2021-2022学年高二(实验班)上学期第一次段考数学(文)试题2017届北京市丰台区高三第二学期一模练习数学文科试卷重庆市第一中学2017-2018学年高二上学期期中考试数学(文)试题(已下线)《高频考点解密》—解密15 空间中的平行与垂直(已下线)解密14 空间中的平行与垂直-备战2018年高考文科数学之高频考点解密辽宁省六校协作体2016-2017学年高二下学期期中考试数学(文)试题浙江省宁波市北仑中学2020-2021学年高二上学期期中数学试题(已下线)解密14 空间中的平行与垂直 (讲义)-【高频考点解密】2021年高考数学(文)二轮复习讲义+分层训练(已下线)解密14 空间中的平行与垂直 (讲义)-【高频考点解密】2021年高考数学(理)二轮复习讲义+分层训练四川省成都第七中学2021-2022学年高二上学期入学数学(文科)试题四川省巴中市恩阳区2021-2022学年高二上学期期中考试数学试题
9 . 在如图所示的几何体中,四边形
为平行四边形,
,
平面
,
,
,
,
,
,且
是
的中点.
(1)求证:
平面
;
(2)求二面角
的余弦值的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6d19fedaf8488f9637cd64efbca83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477dc280b77f5640565dbc0ddf24460a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f36d315245b63a811d5c6f348c17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de927f7e512ea6302e38ef1b453e58c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4901a7eda97d6a307db76c4fb196ba3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4f3da376bd01ef33579e6eecc6f047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0285afe567ca0b32f0ccafc30167cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fab6a076ed5e7a28751ac94d8a54e48.png)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1867936849747968/1868937950134272/STEM/4702faf9-a418-4fdf-a732-b495da9ff8b7.png?resizew=292)
您最近一年使用:0次
2018-01-26更新
|
1238次组卷
|
9卷引用:广西陆川县中学2018届高三3月月考数学(理)试题
10 . 如图,四面体ABCS中,SA、SB、SC两两垂直且相等,点M和点N为线段SA,SB的中点.
![](https://img.xkw.com/dksih/QBM/2018/1/11/1858190046101504/1859000958238720/STEM/776a33e01881443b86128b6dafe1f66f.png?resizew=120)
(1)求证:MN
平面ABC;
(2)求BC与平面SAB所成的角.
![](https://img.xkw.com/dksih/QBM/2018/1/11/1858190046101504/1859000958238720/STEM/776a33e01881443b86128b6dafe1f66f.png?resizew=120)
(1)求证:MN
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce1ddb7003591b033b1a58dc55ede7d.png)
(2)求BC与平面SAB所成的角.
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