名校
解题方法
1 . 如图,在四棱锥P﹣ABCD中,O是边长为4的正方形ABCD的中心,PO⊥平面ABCD,E为BC的中点.
![](https://img.xkw.com/dksih/QBM/2020/9/7/2544883486605312/2545574039625728/STEM/4353b4c6-90bc-4793-af0a-9199cb507b7e.png)
(1)求证:平面PAC⊥平面PBD;
(2)若PE=3,求二面角D﹣PE﹣B的余弦值.
![](https://img.xkw.com/dksih/QBM/2020/9/7/2544883486605312/2545574039625728/STEM/4353b4c6-90bc-4793-af0a-9199cb507b7e.png)
(1)求证:平面PAC⊥平面PBD;
(2)若PE=3,求二面角D﹣PE﹣B的余弦值.
您最近一年使用:0次
2020-09-08更新
|
596次组卷
|
6卷引用:湖北省十堰市丹江口市第一中学2021-2022学年高二下学期五月月考数学试题(2)
湖北省十堰市丹江口市第一中学2021-2022学年高二下学期五月月考数学试题(2)2020届四川省成都市高三第二次诊断性检测理科数学试题(已下线)第32练 2021年高考数学一轮复习模拟题-2021年高考数学一轮复习小题必刷(山东专用)吉林省长春市八中2020届高三第二次诊断性检测数学(理)试题(已下线)调研测试五(B卷 滚动提升检测)-2021年高考数学(理)一轮复习单元滚动双测卷湖南省邵阳市第二中学2021-2022学年高二下学期期中数学试题
名校
2 . 如图,在四棱锥
中,底面ABCD是直角梯形,侧棱
底面ABCD,AB垂直于AD和BC,M为棱SB上的点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/3508b880-f5c3-4dea-89d5-6f3d6656e055.png?resizew=174)
(1)若M为棱SB的中点,求证:
平面SCD;
(2)当
,
时,求平面AMN与平面SAB所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c545f94200a27e96baa417662dc3f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/3508b880-f5c3-4dea-89d5-6f3d6656e055.png?resizew=174)
(1)若M为棱SB的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24565d8d2842481818f96cf52962c50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f899a80d5d287807b8db5067a6edeec.png)
您最近一年使用:0次
2020-09-04更新
|
306次组卷
|
2卷引用:湖北省四校(曾都一中,枣阳一中,襄州一中,宜城一中)2019-2020学年高二上学期期中数学试题
名校
解题方法
3 . 如图,在四棱锥
中,
平面ABCD,
,
,
,
.E为PD的中点,点F为PC上靠近P的三等分点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/223239ba-6654-40e1-9ad7-aae5e21e4afc.png?resizew=160)
(1)求二面角
的余弦值;
(2)设点G在PB上,且
.判断直线AG是否在平面AEF内,说明理由.
![](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/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a923784f083b7f4777891afe06b44e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/223239ba-6654-40e1-9ad7-aae5e21e4afc.png?resizew=160)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74011b64ff147ac2f10c36a11ac1b34d.png)
(2)设点G在PB上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557010ef2b20618df4771ac66daef18f.png)
您最近一年使用:0次
2020-09-04更新
|
355次组卷
|
3卷引用:湖北省武汉外国语学校2020届高三下学期高考冲刺押题联考(一)数学(理)试题
解题方法
4 . 如图,四边形
为正方形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/123b5651-79a3-49d8-9b6b-36f6fac19706.png?resizew=181)
(1)证明:平面
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed533559edd0a5d4293986f8cdc34b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/123b5651-79a3-49d8-9b6b-36f6fac19706.png?resizew=181)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a46fbde58e12b1edc038ae9e921722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac66de8543430fd51e7c18042e626dd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338c6c83ab4abc895ac36ab888a55be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6238a6fb52a9d2e3521ba66ef9a5c247.png)
您最近一年使用:0次
名校
解题方法
5 . 在三棱锥
中,面
面
,
,
,
,
是
的中点.设
,若
,则二面角
的余弦值的范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f3a6e5b286fe1153543f95229aa3ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccfd3cc8d727f5d4f41c834f6851a094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9858febc9ca14e4225220697d6d06794.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/2f4645940aac5c6a53c919e747689dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90bf910b55f4ce7b6272a9271874434b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db04e82f03e6216886d416b35abe85a3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-09-01更新
|
1561次组卷
|
6卷引用: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
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四川省绵阳市2019-2020学年高二下学期期末教学质量测试数学(理)试题(已下线)专题06 空间向量与立体几何(难点)-2020-2021学年高二数学下学期期末专项复习(北师大版2019选择性必修第一册、第二册)(已下线)专题04 空间向量与立体几何的压轴题(二)-【尖子生专用】2021-2022学年高二数学考点培优训练(人教A版2019选择性必修第一册)重庆市2022-2023学年高二下学期3月月度质量检测数学试题(已下线)模块二 专题3 利用空间向量解决立体几何中复杂问题 期末终极研习室(高二人教A版)
6 . 如图,在四棱柱
中,底面
是边长为2的正方形,
,棱
⊥底面
,
,
分别为线段
和
的中点.
![](https://img.xkw.com/dksih/QBM/2020/8/11/2525783518838784/2540400753328128/STEM/eb7d10f1-d69c-4715-a89c-2ac1cba60f72.png)
(1)证明:
;
(2)求二面角
的余弦值.
![](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/08c596aff6331566a0149449183c2024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/2020/8/11/2525783518838784/2540400753328128/STEM/eb7d10f1-d69c-4715-a89c-2ac1cba60f72.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8290323a3da9d76a509ba5d14daabe97.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864689852707154e3a9be79f657f16d4.png)
您最近一年使用:0次
解题方法
7 . 在正方体
中,
,
分别为
和
的中点,则异面直线
与
所成的角的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/5fbafedc202bd0d86c4dfdece9f8f4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408871c2b71ef88d6f556ce53cf73cc9.png)
您最近一年使用:0次
解题方法
8 . 直三棱柱
中,
,
,求直线
与平面
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29ef5a1361ddf48f47a1f8fdb6c08e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
![](https://img.xkw.com/dksih/QBM/2020/8/10/2525089564680192/2539772822953984/STEM/24f2c9f7dd1e4fe5b2f34e7f3eebdaa8.png?resizew=146)
您最近一年使用:0次
解题方法
9 . 如图,在矩形
中,将
沿对角线
折起,使点
到达点
的位置,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/66846629-45e9-4147-b166-bce56e03cb8b.png?resizew=443)
(1)求证:
;
(2)若直线
与平面
所成角的正弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf42acb8d1875acf1775e30ae2e3d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/66846629-45e9-4147-b166-bce56e03cb8b.png?resizew=443)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f92d681685fecaa72dcf38eda81852c.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
您最近一年使用:0次
10 . 如图,在三棱锥
中,平面
平面
,
,点
分别是
的中点,点
是三角形
的重心,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/0a032626-4057-4788-891d-182abc684fa3.png?resizew=182)
(1)求证:
//平面
;
(2)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dfb7f03cb9c3a6882805eec1fb9a646.png)
求二面角
的余弦值.
![](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/78e75e3d7e7e9ed5f88bdf9937b9efd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c2013527c6089d7df59bca21a4598c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/0a032626-4057-4788-891d-182abc684fa3.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dfb7f03cb9c3a6882805eec1fb9a646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10836510bdb2d8fca728a4f02e285d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e820aec9c1a975242fe6d76408a9cde8.png)
您最近一年使用:0次