2020高三·全国·专题练习
名校
解题方法
1 . 如图,在直角梯形
中,
,
,
,
,
,点
在
上,且
,将
沿
折起,使得平面
平面
(如图),
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/81912e79-ae66-4b7d-bf08-ffa594da7ad7.png?resizew=362)
(1)求证:
平面
;
(2)求四棱锥
的体积;
(3)在线段
上是否存在点
,使得
平面
?若存在,求
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/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40560ea08d6cd8c1d4d9661ee6faaa3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/81912e79-ae66-4b7d-bf08-ffa594da7ad7.png?resizew=362)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cf187bc2ede965870b90757b495f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/675127116b1cace5e3158a88b7a2044a.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5d46cc6946821619e937d12d30dc83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747978ec67fee6ee9eb07d02b80987d7.png)
您最近一年使用:0次
2021-03-03更新
|
1172次组卷
|
7卷引用:北京市中国人民大学附属中学亦庄新城学校2020-2021学年高二上学期入学测试数学试题
名校
2 . 如图,四边形
为正方形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490375670521856/2491022464049152/STEM/bd75970ee63f4c02b39181259b3701fe.png?resizew=137)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02450b3417002395524dea35899a97ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9e5f1cfea3643c30c21732073a11ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7f2c76e2d7aafeafbba1f7d740850e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7809a0611650cea73b90fc526018935.png)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490375670521856/2491022464049152/STEM/bd75970ee63f4c02b39181259b3701fe.png?resizew=137)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5f236e0c248607721ff77b6ea8b6ee.png)
您最近一年使用:0次
2020-06-23更新
|
558次组卷
|
6卷引用:北京市大兴区2023届高三下学期数学摸底检测试题
3 . 如图,在三棱柱
中,平面
平面
,四边形
为菱形,点
是棱
上不同于
,
的点,平面
与棱
交于点
,
,
,
.
(Ⅰ)求证:
∥平面
;
(Ⅱ)求证:
平面
;
(Ⅲ)若二面角
为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eff0db05826cbff651faf0144904b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ac553945e7183df1f45964fedf88f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2f39d3fcb1664705228e683c2cc3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57eb483244073b76d7acd49feaf18280.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd94d3c3765c52e2d6375f1959686430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f861273767ae7aeb7251dbcfe4554c.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89195bacd53d43195e70c12b5cfa041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
(Ⅲ)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512c8feb90b36a8035556fec4d0b86f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://img.xkw.com/dksih/QBM/2017/11/14/1817064720875520/1818519677435904/STEM/5c4c541a-2fa5-41b9-904d-c8ae0038f93b.png)
您最近一年使用:0次
解题方法
4 . 如图,四棱锥P﹣ABCD的底面为正方形,且PA⊥底面ABCD中,AB=1,PA=2.
![](https://img.xkw.com/dksih/QBM/2016/4/13/1572592397033472/1572592402825216/STEM/1ae63a1c54fe465dab46b3499c96d2bb.png?resizew=235)
(1)求证:BD⊥平面PAC;
(2)求三棱锥B﹣PAC的体积;
(3)在线段PC上是否存在一点M,使PC⊥平面MBD,若存在,请证明;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2016/4/13/1572592397033472/1572592402825216/STEM/1ae63a1c54fe465dab46b3499c96d2bb.png?resizew=235)
(1)求证:BD⊥平面PAC;
(2)求三棱锥B﹣PAC的体积;
(3)在线段PC上是否存在一点M,使PC⊥平面MBD,若存在,请证明;若不存在,说明理由.
您最近一年使用:0次
2016-12-04更新
|
905次组卷
|
2卷引用:2015-2016学年北京市大兴区高二上学期期末文科数学试卷
5 . 在如图所示的几何体中, 四边形
是正方形,
底面
.
,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/868bd94f-4e58-433a-9bc1-bf7ec4b1f547.png?resizew=187)
(1)若
与
交于点
,求证:
平面
;
(2)求证:
平面
;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd6020b78ff385667b30088ecadeadd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bbd04b75eb3db55fc13d78e7c30188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1496042c1d721cffd25053e997a9a97.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/868bd94f-4e58-433a-9bc1-bf7ec4b1f547.png?resizew=187)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2015/3/18/1572013855776768/1572013861412864/STEM/07c0af48afcf44848f705cd74c99d5a7.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2015/3/18/1572013855776768/1572013861412864/STEM/9b6965ed831146f39d5dff72d91536be.png?resizew=37)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2015/3/18/1572013855776768/1572013861412864/STEM/11d05c27fb834516871436f4f3ed2763.png?resizew=43)
![](https://img.xkw.com/dksih/QBM/2015/3/18/1572013855776768/1572013861412864/STEM/0e4c108b955d4c54b98de5c022da93cb.png?resizew=37)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fab6a076ed5e7a28751ac94d8a54e48.png)
您最近一年使用:0次
2016-12-03更新
|
3351次组卷
|
2卷引用:2015届北京市大兴区高三上学期期末考试理科数学试卷