1 . 如图,在三棱柱
中,底面
为等边三角形,过
作平面
平行于
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2017/9/22/1779463192952832/1780433722441728/STEM/c511f55dfac348f8a5e90e102947a7de.png?resizew=295)
(1)求证:
;
(2)若四边形
是边长为2的正方形,且
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2017/9/22/1779463192952832/1780433722441728/STEM/c511f55dfac348f8a5e90e102947a7de.png?resizew=295)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c5aa738865bade7eb71bed5b7e4cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a95c0c1a8addfc20c732fa5c4b473b7.png)
您最近一年使用:0次
解题方法
2 . 已知
,
表示两条不同的直线,
,
表示两个不同的平面,则下列四个命题中,所有正确命题的序号为____ .
① 若
,
,则
; ② 若
,
,则
;
③ 若
,
,则
; ④ 若
,
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
① 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6e422b2e6f6dada4d8c369559a077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a042a14e1c3c915ad11544c9e1e57da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f747152f006301e03b643afb80195c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a042a14e1c3c915ad11544c9e1e57da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4ded3c4bc7a2212f2a0eb5f9753de5.png)
③ 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808c6d37467a5c995d71e49408503927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4042f9c51f83e3367d496e851735d7f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a042a14e1c3c915ad11544c9e1e57da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a93a52c2b943e4c70ace99ed802d2b5.png)
您最近一年使用:0次
解题方法
3 . 如图,在斜三棱柱
中,侧面
是菱形,
与
交于点O,E是棱
上一点,且
平面
.
![](https://img.xkw.com/dksih/QBM/2017/3/15/1644570517929984/1649114046242816/STEM/1698d9e74e79470bb6f2ac9988a94c94.png?resizew=212)
(1)求证:E是
的中点;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af142a6050b54e8b5777a085d4597481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://img.xkw.com/dksih/QBM/2017/3/15/1644570517929984/1649114046242816/STEM/1698d9e74e79470bb6f2ac9988a94c94.png?resizew=212)
(1)求证:E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1515a445310d259a080d02e16c2e58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619174cab53737ab3547ec3970f42575.png)
您最近一年使用:0次
2017-03-22更新
|
587次组卷
|
2卷引用:2016-2017学年江苏苏锡常镇四市高三教学情况调研(一)数学试卷
名校
解题方法
4 . 在直三棱柱
中,平面
与棱
分别交于点
,且直线
平面
.有下列三个命题:①四边形
是平行四边形;②平面
平面
;③平面
平面
.其中正确的命题有.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5977e89d4dae9d1216d8bda03c60f757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f782f255e05e8ec6a0d632f9beddab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60be170a52db82cf37b30db0cde26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
A.①② | B.②③ | C.①③ | D.①②③ |
您最近一年使用:0次
2017-02-08更新
|
744次组卷
|
7卷引用:2017届四川成都市高三文一诊考试数学试卷
2017届四川成都市高三文一诊考试数学试卷2017届四川成都市高三理一诊考试数学试卷2017-2018学年高三二轮数学同步训练:小题压轴突破练(已下线)二轮复习测试专项 【新课标版理科数学】专题五 立体几何(已下线)二轮复习测试专项 【新课标版文科数学】专题五 立体几何青海省西宁市城西区青海湟川中学2020-2021学年高二上学期期中数学试题(已下线)第09讲 空间点、直线、平面之间的关系(核心考点讲与练)-2021-2022学年高一数学考试满分全攻略(人教A版2019必修第二册)
解题方法
5 . 如图,已知四边形
是平行四边形,点
是平面
外一点,
是
的中点,在
上取一点
,过
和
作平面交平面
于
.
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011abe509df00fe9410ab08b585ad7db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8adf16ba03aeaab7e159522bee841377.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/d9c9e451-d0e4-48e6-8aa1-3ef79d897047.png?resizew=176)
您最近一年使用:0次
6 . 已知,如图所示的正方体的棱长为4,E、F分别为A1D1、AA1的中点,过C1、E、F的截面的周长为___________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/a468ffe0-ed27-40a7-8e26-4380c51aff8d.png?resizew=141)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/a468ffe0-ed27-40a7-8e26-4380c51aff8d.png?resizew=141)
您最近一年使用:0次
2016-12-04更新
|
286次组卷
|
2卷引用:2016-2017学年江西上高县二中高二理9月月考数学试卷
7 . 给出下列四个命题:
①平行于同一平面的两条直线平行;
②垂直于同一平面的两条直线平行;
③如果一条直线和一个平面平行,那么它和这个平面内的任何直线都平行;
④如果一条直线和一个平面垂直,那么它和这个平面内的任何直线都垂直.
其中正确命题的序号是
①平行于同一平面的两条直线平行;
②垂直于同一平面的两条直线平行;
③如果一条直线和一个平面平行,那么它和这个平面内的任何直线都平行;
④如果一条直线和一个平面垂直,那么它和这个平面内的任何直线都垂直.
其中正确命题的序号是
A.①② | B.①③ | C.②④ | D.③④ |
您最近一年使用:0次
8 . 有一段演绎推理是这样的:“若一条直线平行于一个平面,则此直线平行于这个平面内的所有直线”.已知直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
平面
,直线
平面
,则直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
直线
”.你认为这个推理( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b38aa358fe97b47a1d2cb32ffa1f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.结论正确 | B.大前提错误 | C.小前提错误 | D.推理形式错误 |
您最近一年使用:0次
2016-12-04更新
|
226次组卷
|
3卷引用:2015-2016学年吉林省毓文中学高二下期中理科数学试卷
解题方法
9 . 如图,在五面体
中,四边形
是平行四边形.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572664178180096/1572664183767040/STEM/70fd1e4654fd459e943d872f9722a504.png?resizew=214)
(1)若
,
,求证:平面
平面
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572664178180096/1572664183767040/STEM/70fd1e4654fd459e943d872f9722a504.png?resizew=214)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c23e376ab222814e0029d2adb5a957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bd02e0adeae92ba9526261b1baf797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5628323a7eeb11213df5c9048b3543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
10 . 若
,
是不同的直线,
,
是不同的平面,则下列命题中,错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次