名校
1 . 如图,四边形ABCD为矩形,四边形BCEF为直角梯形,BF//CE,BF⊥BC,BF<CE,BF=2,AB=1,AD=
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/e65ed7e7-22e8-4c6c-84d9-e3488913ee10.png?resizew=166)
(1)求证:BC⊥AF;
(2)求证:AF//平面DCE;
(3)若二面角E-BC-A的大小为120°,求直线DF与平面ABCD所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/e65ed7e7-22e8-4c6c-84d9-e3488913ee10.png?resizew=166)
(1)求证:BC⊥AF;
(2)求证:AF//平面DCE;
(3)若二面角E-BC-A的大小为120°,求直线DF与平面ABCD所成的角.
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解题方法
2 . 如图,在直三棱柱ABC-A1B1C1中,M,N分别是AC和BB1的中点.
![](https://img.xkw.com/dksih/QBM/2022/9/1/3057194414809088/3062493218488320/STEM/5f2c462336bc4e61931708816442a537.png?resizew=193)
(1)求证:MN
平面A1B1C;
(2)若AB=3,BC=4,AC=6,AA1=3,求三棱锥C1-A1B1C的体积.
![](https://img.xkw.com/dksih/QBM/2022/9/1/3057194414809088/3062493218488320/STEM/5f2c462336bc4e61931708816442a537.png?resizew=193)
(1)求证:MN
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
(2)若AB=3,BC=4,AC=6,AA1=3,求三棱锥C1-A1B1C的体积.
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名校
解题方法
3 . 如图,在三棱锥
中,
平面
,
,
.求证:
;
(2)若
,
分别在棱
,
上,且
,
,问在棱
上是否存在一点
,使得
平面
.若存在,则求出
的值;若不存在.请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c71dbf267939080668be464f1aa60da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0530f462e5ec1e58c46e1f7644d0cc21.png)
(2)若
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de02d1d5b7ac04bce54be393218922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760e8882e84ecd68bc889a55efce5d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d3f076d3f5a78fc081c252e9a55d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/261fbbc173664b0047448fef17763dfb.png)
您最近一年使用:0次
2021-08-07更新
|
605次组卷
|
5卷引用:一轮复习大题专练46—立体几何(探索性问题2)-2022届高三数学一轮复习
(已下线)一轮复习大题专练46—立体几何(探索性问题2)-2022届高三数学一轮复习山西省太原市2020-2021学年高一下学期期末数学试题贵州省“三新”联盟校2021-2022学年高一下学期期末联考数学试题湖北省荆州市沙市中学2022-2023学年高二上学期第一次月考数学试题湖北省荆州市沙市区2022-2023学年高二上学期9月第一次月考数学试题
解题方法
4 . 如图,在四棱锥
中,
为等边三角形,且边长为2,BC垂直于AB,
,E为PA的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/b00516d3-fc22-441f-9d36-3f42b0bd698c.png?resizew=173)
(1)证明:
平面PBC.
(2)若
底面ABCD,且
,求点A到平面PBC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30a9e0a1f391cc42fbc19cf5b92a2569.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/b00516d3-fc22-441f-9d36-3f42b0bd698c.png?resizew=173)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7440b41636c761b0910639e310ff7dfb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e0c2b528dfd10dc3e6d79ad8bb855d.png)
您最近一年使用:0次
2022高三·河北·专题练习
名校
解题方法
5 . 已知四棱锥
如图所示,
,
,
,平面
平面
,点
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/2021/9/29/2818542764204032/2819401981984768/STEM/a716b7178d1349b2a609e342b1516685.png?resizew=219)
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ea5d7cfb1712e1aad407159c3fc6a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ff67dbfe0050270169791ae85ef940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ce5e00b89a3cd9c39d45c13a0afed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.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/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://img.xkw.com/dksih/QBM/2021/9/29/2818542764204032/2819401981984768/STEM/a716b7178d1349b2a609e342b1516685.png?resizew=219)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78172568aac9805d2ea2d5f742bf80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4a6b8ef3e79b4482388c3391d8b18.png)
您最近一年使用:0次
2021-09-30更新
|
497次组卷
|
3卷引用:一轮复习大题专练48—立体几何(距离问题2)—2022届高三数学一轮复习
(已下线)一轮复习大题专练48—立体几何(距离问题2)—2022届高三数学一轮复习四川省遂宁中学校2021-2022学年高二上学期期中考试数学(理)试题河南省中原名校2021-2022学年高二上学期12月联考理科数学试题
名校
6 . 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:河北省承德市联校2018届高三上学期期末考试数学(理)试题
名校
7 . 如图,四棱锥P-ABCD中,底面ABCD为矩形,PD⊥平面ABCD,点E、F分别是AB和PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/961c6f82-b6fa-4f7c-939c-4cb71f36f319.png?resizew=191)
(1)求证:AB⊥平面PAD;
(2)求证:EF//平面PAD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/961c6f82-b6fa-4f7c-939c-4cb71f36f319.png?resizew=191)
(1)求证:AB⊥平面PAD;
(2)求证:EF//平面PAD.
您最近一年使用:0次
2019-10-04更新
|
908次组卷
|
6卷引用:河北省博野中学2019-2020学年高一下学期6月月考数学试题
名校
8 . 如图1,在等腰梯形
中,
分别是
的中点,
,
,将
沿着
折起,使得点
与点
重合,平面
平面
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/e0ad0bd0-a3b8-4436-b03a-f5a69d2a5de6.png?resizew=357)
(1)当
时,证明:
平面
;
(2)若平面
与平面
夹角的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54eb01dd383cde273a69b863f96528e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b85dbac306107b711eaa66690330b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1016eca2e30c6c75ff2b6bdd63f7ea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac48b9ac8efbf41d6ab5242d247bd89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/e0ad0bd0-a3b8-4436-b03a-f5a69d2a5de6.png?resizew=357)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2597b5554284e275367c25529c6750f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8be7470f11eed5536f3baf65e3a125d.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8be7470f11eed5536f3baf65e3a125d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83fb9ac8a18e78a4c56da79514b5ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2022-12-14更新
|
213次组卷
|
2卷引用:河北省邯郸市涉县第一中学2023届高三上学期期中数学试题
解题方法
9 . 如图,四边形
为矩形,
和
均为等腰直角三角形,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/7311fd29-f1cf-43b1-b0b6-7cf9c2ded34d.png?resizew=129)
(1)求证:
平面
;
(2)
,问是否存在
,使得棱锥
的高恰好等于
?若存在,求出
的值;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/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a00d05c60999eff91345a545fb57e9af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c640ca0dde46063402beda887cb646b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a72a523e7db66ac0e08ec294dc4d5b06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/7311fd29-f1cf-43b1-b0b6-7cf9c2ded34d.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec47f6d6cb1eeefbb466e4fe71fd568c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d3d0d1f098f6eff0b3643136fd96d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b635e62c3b1f4a57feac8d22be84ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcf0e49bbefd0698ae26a5a2baa7e0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2020-04-11更新
|
528次组卷
|
3卷引用:2020届河北省保定市高三第一次模拟数学(文)试题
2020届河北省保定市高三第一次模拟数学(文)试题江西省南昌市新建县第一中学2020届高三第二次适应性考试数学(文)试题(已下线)调研测试五(A卷 基础过关检测)-2021年高考数学(文)一轮复习单元滚动双测卷
10 . 如图,在三棱锥P-ABC中,
,平面
平面ABC,点D在线段BC上,且
,F是线段AB的中点,点E是PD上的动点.
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368566347227136/2369736597110784/STEM/42711ab1362f483a9f014e6d63b5ede0.png?resizew=225)
(1)证明:
.
(2)当EF//平面PAC时,求三棱锥C-DEF的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d0c6002354c2169ed55b41f08dd1460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499f02e624b84c5fa5d479d24a3ed99a.png)
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368566347227136/2369736597110784/STEM/42711ab1362f483a9f014e6d63b5ede0.png?resizew=225)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b212ff4649b37b655010ef687a5f4fe.png)
(2)当EF//平面PAC时,求三棱锥C-DEF的体积.
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