名校
解题方法
1 . 如图1,直角梯形ABCD中,AD∥BC,∠ABC=90°,AD=AB=
BC,E是底边BC上的一点,且EC=3BE.现将△CDE沿DE折起到△C1DE的位置,得到如图2所示的四棱锥C1﹣ABED,且C1A=AB.
(1)求证:C1A⊥平面ABED;
(2)若M是棱C1E的中点,求直线BM与平面C1DE所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/fd8e2b44-42b6-44b2-9838-45ae44c361df.png?resizew=342)
(1)求证:C1A⊥平面ABED;
(2)若M是棱C1E的中点,求直线BM与平面C1DE所成角的正弦值.
您最近一年使用:0次
2016-12-04更新
|
379次组卷
|
2卷引用:2015-2016学年江西省上饶中学高二重点班下学期第一次月考数学试卷
2 . 如图,在三棱柱
中,已知
侧面
,
,
,
,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/2016/4/12/1572587925102592/1572587931385856/STEM/8ab9e42b59d240dc812bc45685bd4332.png)
(Ⅰ)求证:
平面
;
(Ⅱ)试确定点
的位置,使得二面角
的余弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbe3ec31a79a171dcf274ff99e50762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4639a9dc0bc99101cbde59fef04b4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4debc320eb25754648fe55b7407965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/2016/4/12/1572587925102592/1572587931385856/STEM/8ab9e42b59d240dc812bc45685bd4332.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b4d9f2a8ca38c7589980e11627e43b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(Ⅱ)试确定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c286a31b1ef4cbfa029969cbfccf270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
您最近一年使用:0次
2016-12-04更新
|
929次组卷
|
4卷引用:江西省新余市2018届高三上学期期末质量检测数学(理)试题
解题方法
3 . 如图,在四棱锥
中,底面
是正方形,侧棱
底面
,
,
是
的中点,作
交
于点
.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
平面
;
(2)求二面角
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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffddeafce03aae663bc823e2d5127c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466fabcaac59132fea648ff35342ec9d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ceb3c582b074d63bd7f8538b18bdb5.png)
![](https://img.xkw.com/dksih/QBM/2016/3/29/1572563453788160/1572563459653632/STEM/f1d732a65b30488a8c0a4d52a6b9a2fb.png?resizew=202)
您最近一年使用:0次
4 . 如图,在四棱锥
中,
为等边三角形,平面
平面
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/8f66378a-d9c1-4c68-ba07-30e33819c0b8.png?resizew=221)
(1)求证:
;
(2)求二面角
的余弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e409a3a0db612b3fbe8f26bc40e83e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03952d664fba91020fc5f3bcf2f9746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476b0b8378f4b0f73f3dc5d84d89f616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f85543243052612fb75694d6978bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9af0f7538dc8fc5683ef4959a11c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/8f66378a-d9c1-4c68-ba07-30e33819c0b8.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd4d3ed0d4f1a2296de6a91445376f2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3541d43bfeba7f5a5cf0112b93932020.png)
您最近一年使用:0次
2016-12-04更新
|
254次组卷
|
2卷引用:2015-2016学年江西省南城一中高二上学期期中考试理科数学试卷
5 . 若直线
的方向向量
,平面
的一个法向量
,则直线
与平面
所成角的正弦值等于___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21e6482dfe349f0f139632d0d0282def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e63aa43ad43ebdcd5e8c6c7eb1b6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2016-12-04更新
|
1273次组卷
|
4卷引用:2015-2016学年江西吉安一中高二上第一次段考理科数学卷
6 . 已知
是圆
的直径,
是圆
上异于
的一个动点,
垂直于圆
所在的平面,
.
(1)求证:
平面
;
(2)若
,求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb6c8e7e8f7b564720b45442d59d513.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
您最近一年使用:0次
2014·陕西西安·三模
名校
7 . 如图,直三棱柱
中,
为等腰直角三角形,
,且
.
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/1/13/1572430991204352/1572430997495808/STEM/ff06904ffcbd47e0a059b4c6b89f1fea.png)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4482938199ddfa1129dc9c9975c3d35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fae7752652ee96a9b1b6b7426fa22a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642af1694695212e53b0e4fcb30075dd.png)
![](https://img.xkw.com/dksih/QBM/2016/1/13/1572430991204352/1572430997495808/STEM/ff06904ffcbd47e0a059b4c6b89f1fea.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2a3c3bc213f63c9846dcc461ed3cc9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acdeba882e69ca4bc6bcdea1494f93c.png)
您最近一年使用:0次
2016-12-04更新
|
422次组卷
|
6卷引用:【全国百强校】江西省南昌市第二中学2017-2018学年高二下学期期末考试数学(理)试题
8 . 如图,在直角梯形
中,
,
,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/cf04cd4b-4cbe-4dab-982f-b44ac757174e.png?resizew=300)
(Ⅰ)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
平面
;
(Ⅱ)在直线
上是否存在点
,使二面角
的大小为
?若存在,求出
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ff6d7dd48b57f03d82d2c522ee9b94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c41158715d94c6c9ffebdee957d2618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6341d610ae81c6438772fbacfc2a1657.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/cf04cd4b-4cbe-4dab-982f-b44ac757174e.png?resizew=300)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
(Ⅱ)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a32a0fe258b74485e5b57891b4542c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
您最近一年使用:0次
9 . 如图,四棱柱
中,底面
是矩形,且
,
,
,若
为
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2015/12/24/1572392378597376/1572392381956096/STEM/150e2c67cbed4028984f66de19ae012f.png?resizew=239)
(1)求证:
平面
;
(2)线段
上是否存在一点
,使得二面角
为
?若存在,求出
的长;不存在,说明理由.
![](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/ae79b7d1fc4131ae3b9de76e2fa45e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f436b2f2edf1a47f80a4c439d6938646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a77ddea1345e7d0685b106cd017f21d.png)
![](https://img.xkw.com/dksih/QBM/2015/12/24/1572392378597376/1572392381956096/STEM/150e2c67cbed4028984f66de19ae012f.png?resizew=239)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e5981445b6f2a6c58974158d96a4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075aa39e7090f88f04abd544ed32b044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
10 . 如图,在四棱锥P—ABCD中,底面ABCD为菱形且∠DAB=60°,O为AD中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/c517bbfc-d923-496b-9f5b-caad85c62644.png?resizew=172)
(Ⅰ)若PA=PD,求证:平面POB⊥平面PAD;
(Ⅱ)若平面PAD⊥平面ABCD,且PA=PD=AD=2,试问在线段PC上是否存在点M,使二面角M—BO—C的大小为60°,如存在,求
的值,如不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/c517bbfc-d923-496b-9f5b-caad85c62644.png?resizew=172)
(Ⅰ)若PA=PD,求证:平面POB⊥平面PAD;
(Ⅱ)若平面PAD⊥平面ABCD,且PA=PD=AD=2,试问在线段PC上是否存在点M,使二面角M—BO—C的大小为60°,如存在,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0519ba613bf121a2c1bc28c948266d74.png)
您最近一年使用:0次
2016-12-03更新
|
2730次组卷
|
3卷引用:江西省信丰中学2018-2019学年高二上学期第五次月考数学(理)试题