解题方法
1 . 如图,在正方体
中,M为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/1972fb34-f7ba-4c4b-9e6e-4832732872f9.png?resizew=146)
(1)试作出平面
与平面
的交线l,并说明理由;
(2)用平面
去截正方体,所得两部分几何体的体积分别为
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/1972fb34-f7ba-4c4b-9e6e-4832732872f9.png?resizew=146)
(1)试作出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e729d9e7acf6f180c311622c251fd30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)用平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e729d9e7acf6f180c311622c251fd30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef9b28d27417e49032fddbf8b4a64af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
您最近一年使用:0次
2021-07-10更新
|
539次组卷
|
3卷引用:安徽省皖八联盟2020-2021学年高一下学期统测数学试题
名校
2 . 如图,三棱锥
中,点
在平面
的投影为点
,
,
,点
分别是线段
,
的中点,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724317606764544/2726332800663552/STEM/ca3f3ffb-8256-4839-80e6-297b1897b28e.png?resizew=246)
(1)若
,求证:
;
(2)若
平面
,求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91b2f1719b081357ea38cf47653592a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e45142459df2244062cdc856b012a8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fddbb7f29e8672f34941fe70b0a1e45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724317606764544/2726332800663552/STEM/ca3f3ffb-8256-4839-80e6-297b1897b28e.png?resizew=246)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a606499df4459e5fbd6021c61a805359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986d7dffcd6a92bbfeedcc60a0620ca.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cbc7987494d031e1d051da8e5282522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31bb8f443480c2d391a145377e212d70.png)
您最近一年使用:0次
2021-05-22更新
|
546次组卷
|
2卷引用:安徽省部分重点学校2021届高三下学期最后一卷文科数学试题
名校
3 . 如图,已知
为正三角形,D为AB的中点,E在AC上,且
,现沿DE将
折起,折起过程中点A仍然记作点A,使得平面
平面BCED,在折起后的图形中.
![](https://img.xkw.com/dksih/QBM/2021/9/13/2807128439554048/2815225309601792/STEM/80d94deb-2f09-4c04-872f-88daac4f7a21.png?resizew=472)
(1)在AC上是否存在点M,使得直线
平面ABD.若存在,求出点M的位置;若不存在,说明理由.
(2)求平面ABD与平面ACE所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8f6c9335373be2e09046a1e51424f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://img.xkw.com/dksih/QBM/2021/9/13/2807128439554048/2815225309601792/STEM/80d94deb-2f09-4c04-872f-88daac4f7a21.png?resizew=472)
(1)在AC上是否存在点M,使得直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6dfed58659a9cab4d1836c3d2effdc.png)
(2)求平面ABD与平面ACE所成锐二面角的余弦值.
您最近一年使用:0次
2021-09-24更新
|
526次组卷
|
2卷引用:安徽省宿州市砀山中学2021-2022学年高二上学期第一次质量检测数学试题
名校
4 . 如图,四棱锥
的底面是矩形,平面
平面
,E,F分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899364410368000/2909296488448000/STEM/f86988ac-5adf-4ce0-bf46-f5a39c9884a6.png?resizew=203)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb864b2f3bb242f12478063b1aca2596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7366da07065712da11602f4afce8cbed.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899364410368000/2909296488448000/STEM/f86988ac-5adf-4ce0-bf46-f5a39c9884a6.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c6e025c4876a06fc3a82ae5d476779.png)
您最近一年使用:0次
2022-02-04更新
|
314次组卷
|
2卷引用:安徽省部分学校2021-2022学年高三上学期期末联考理科数学试题
名校
解题方法
5 . 在四棱锥
中,底面
为矩形,
平面
,E,F分别为
,
的中点.求证:
![](https://img.xkw.com/dksih/QBM/2021/1/29/2646681624240128/2647424779902976/STEM/7b11c4d4-f2b3-490c-aa9e-e73fa5c622ba.png)
(1)
平面
;
(2)平面
平面
.
![](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/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/29/2646681624240128/2647424779902976/STEM/7b11c4d4-f2b3-490c-aa9e-e73fa5c622ba.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
名校
6 . 如图,在四棱锥
中,
底面
,底面
是边长为1的菱形,
,
,
为
的中点,
为
的中点,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2021/12/18/2875341980663808/2912805677457408/STEM/ae324d00-37e8-4ba5-b126-1968ee4053cd.png?resizew=169)
(1)求证:
平面
;
(2)求
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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb552b9e21dbaba74d11aa747790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afaa76e94414331574f42873e2b12c3.png)
![](https://img.xkw.com/dksih/QBM/2021/12/18/2875341980663808/2912805677457408/STEM/ae324d00-37e8-4ba5-b126-1968ee4053cd.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
名校
7 . 如图,在三棱台ABC﹣A1B1C1中,D,E分别是AB,AC的中点,B1E⊥平面ABC,△AB1C是等边三角形,AB=2A1B1,AC=2BC,∠ACB=90°.
![](https://img.xkw.com/dksih/QBM/2019/1/3/2110811852365824/2111689648562176/STEM/91a9089e0c8a45e083aad6aad30ce27c.png?resizew=183)
(1)证明:B1C∥平面A1DE;
(2)求二面角A﹣BB1﹣C的正弦值.
![](https://img.xkw.com/dksih/QBM/2019/1/3/2110811852365824/2111689648562176/STEM/91a9089e0c8a45e083aad6aad30ce27c.png?resizew=183)
(1)证明:B1C∥平面A1DE;
(2)求二面角A﹣BB1﹣C的正弦值.
您最近一年使用:0次
2018-12-03更新
|
1282次组卷
|
6卷引用:安徽省阜阳市太和中学2019-2020学年高二下学期开学考试数学(理)试题
解题方法
8 . 如图所示,在边长为
的菱形
中,
,沿
将三角形
向上折起到
位置,
为
中点,若
为三角形
内一点(包括边界),且
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/025e8c8b-0df1-44b1-9caa-21c357c903bc.png?resizew=171)
(1)求点
轨迹的长度;
(2)若
平面
,求证:平面
平面
,并求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7502eee6f33e8c940dec63ab6473c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.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/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/025e8c8b-0df1-44b1-9caa-21c357c903bc.png?resizew=171)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe0ccf24d760c77535a70c92dad145.png)
您最近一年使用:0次
解题方法
9 . 在如图所示的几何体中,四边形ABCD为正方形,
平面ABCD,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/44534efe-687a-4d8b-85b1-25d60ccd1609.png?resizew=152)
(1)求证:
平面PAD;
(2)求直线AB与平面PCE所成角的正弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e2605cd905f703a8fda77540347ad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82465b63174087aeba7788ed984583d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/44534efe-687a-4d8b-85b1-25d60ccd1609.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a20ea69475dcf57a5ff18c13eceaaa.png)
(2)求直线AB与平面PCE所成角的正弦值;
您最近一年使用:0次
10 . 如图,四边形ABCD与BDEF均为菱形,且
,平面
平面BDEF,AC与BD交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/62c56c30-1143-4ea3-bde6-39d97a268ef8.png?resizew=158)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
平面FBC;
(2)求平面AFC与平面BFC夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd3ed8807db1250667c70433e1b6f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/62c56c30-1143-4ea3-bde6-39d97a268ef8.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)求平面AFC与平面BFC夹角的余弦值.
您最近一年使用:0次