名校
1 . 如图,在四棱锥
中,四边形
为平行四边形,
面
,
,
是
的中点,过点
作
于点
.
![](https://img.xkw.com/dksih/QBM/2021/1/6/2630315787673600/2633097130205184/STEM/f897938f6a7e4d9389f43810fe043db5.png?resizew=192)
(1)求证:
平面
;
(2)若
,求证:
;
(3)若四边形
为正方形,在线段
上是否存在点
,使得二面角
的平面角的余弦值为
?若存在,求
的值;若不存在,请说面理由.
![](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/a820c531ccb40c5c487ca4657fb8dd4f.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df44d1ff1227c4de03ca21ac87f3f86a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/1/6/2630315787673600/2633097130205184/STEM/f897938f6a7e4d9389f43810fe043db5.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96da3bd0a487a94ac02074500636938c.png)
(3)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19bbba298f59087199b8ac15fc290e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52827b0748edee7b8a1576ed3c824684.png)
您最近一年使用:0次
名校
解题方法
2 . 已知直角
,
,
,
,
分别是
的中点,将
沿着直线
翻折至
,形成四棱锥
,则在翻折过程中,①
;②
;③
;④平面
平面
,不可能成立的结论是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51a4b0c34bf6e17ed63d1968659daf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32cec7a97884ee6cdf106b312485482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede9e40f5cf450db6f01194559a19c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743e93650b430317090e3f3b632a8d4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea4d1a88e0b7065ed99ed24b921f434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac48b9ac8efbf41d6ab5242d247bd89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
A.①②③ | B.①② | C.③④ | D.①②④ |
您最近一年使用:0次
2018-02-11更新
|
398次组卷
|
4卷引用:陕西省黄陵中学高新部2017-2018学年高二下学期开学考试数学(文)试题
陕西省黄陵中学高新部2017-2018学年高二下学期开学考试数学(文)试题浙江省嘉兴市2017-2018学年高二上学期期末检测数学试题(已下线)江苏省南通市如皋市2020-2021学年高一下学期期中数学试题福建省福州华侨中学2022届高三上学期期中考数学试题
3 . 如图,在四棱锥
中,底面
为矩形,平面
平面
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/686fb11e-aa39-4677-9121-fffbf7e2a583.png?resizew=191)
(1)求证:
;
(2)求证:
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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/686fb11e-aa39-4677-9121-fffbf7e2a583.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d31767eb718a0327eca546fe6a189cb.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2012·浙江台州·二模
名校
4 . 如图,AC是圆O的直径,点B在圆O上,∠BAC=30°,BM⊥AC交AC于点M,EA⊥平面ABC,FC//EA,AC=4,EA=3,FC=1.
(1)证明:EM⊥BF;
(2)求平面BEF与平面ABC所成的二面角的余弦值.
(1)证明:EM⊥BF;
(2)求平面BEF与平面ABC所成的二面角的余弦值.
![](https://img.xkw.com/dksih/QBM/2012/7/30/1570943890194432/1570943895568384/STEM/5e458b96-13c1-4413-af71-836dc330dd33.png?resizew=146)
您最近一年使用:0次
2016-12-01更新
|
1376次组卷
|
9卷引用:2017届陕西师范大学附属中学高三上学期第二次模考数学(理)试卷
2017届陕西师范大学附属中学高三上学期第二次模考数学(理)试卷陕西省西安市长安区第一中学2017届高三4月模拟考试数学(理)试题(已下线)2012届浙江省台州中学高三下学期第二次统练文科数学(已下线)2012届浙江省宁波市五校高三适应性考试理科数学试卷(已下线)2012届浙江省东阳中学高三5月模拟考试理科数学试卷(已下线)2014届浙江省绍兴市第一中学高三上学期回头考试理科数学试卷2016届海南省文昌中学高三上学期期末考试理科数学试卷2018届高三数学训练题:阶段滚动检测试题(六) 广东省广州市第二中学高二上学期数学人教A版选修2-1模块测试试卷
名校
5 . 空间四边形ABCD的四边相等,则它的两对角线AC、BD的关系是 ( )
A.垂直且相交 | B.相交但不一定垂直 |
C.垂直但不相交 | D.不垂直也不相交 |
您最近一年使用:0次
2017-12-02更新
|
319次组卷
|
6卷引用:陕西省商洛市丹凤中学2017-2018学年高一下学期3月月考数学试题
陕西省商洛市丹凤中学2017-2018学年高一下学期3月月考数学试题人教A版高中数学必修二 2.3.1直线与平面垂直的判定1(已下线)步步高高一数学寒假作业:作业14空间中的垂直关系广东省深圳市宝安区2019-2020学年高二上学期期末数学试题(已下线)第八章 8.6.2 直线与平面垂直(作业)-【上好课】2020-2021学年高一数学同步备课系列(人教A版2019必修第二册)6.5.1直线与平面垂直的判定 课时练习2020-2021学年高一下学期数学北师大版(2019)必修第二册
6 . 如图,在直三棱柱
中,
,
.
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572681054191616/1572681059565568/STEM/e146baba909f4c22999aa4260ee6bff8.png)
(I)求证:
平面
;
(II)若
为
的中点,求
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc792c7c341a694285dfa6632f39fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd8f940b796af67206b3f9dd410a407.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572681054191616/1572681059565568/STEM/e146baba909f4c22999aa4260ee6bff8.png)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2188d1ed27e2613d2aab38d516524cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(II)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
您最近一年使用:0次
2016-12-04更新
|
651次组卷
|
3卷引用:2015-2016学年陕西省西安市长安一中高二下期中数学试卷
2015-2016学年陕西省西安市长安一中高二下期中数学试卷甘肃省白银市靖远县第四中学2019-2020学年高一上学期12月月考数学试题(已下线)【新东方】高中数学20210527-002【2021】【高二下】
7 . 如图,已知直角梯形
中,
且
,又
分别为
的中点,将△
沿
折叠,使得
.
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/56b7d5d5edcd43a687f9ee19ae2b5e9f.png?resizew=408)
(Ⅰ)求证:AE⊥平面CDE;
(Ⅱ)求证:FG∥平面BCD;
(Ⅲ)在线段AE上找一点R,使得平面BDR⊥平面DCB, 并说明理由.
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/7fae0b789a674668866d72e6ce58fc43.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/3c415b28e062424c9652840d0f78b114.png?resizew=106)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/d45eee98176049f09074ecef64d1ead8.png?resizew=67)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/c7f488d1f08142c3927ccec27f1a2c4f.png?resizew=34)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/edd36a02d0284d96b32cd2f8d09a82c6.png?resizew=49)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/23c48d1f65fc4330bb90c64787e2e0fb.png?resizew=38)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/ca515835975f4fe1a42b60e534ce631d.png?resizew=26)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/90c000c739384c2993bbe6e3ea38139a.png?resizew=69)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944827240448/1571944833122304/STEM/56b7d5d5edcd43a687f9ee19ae2b5e9f.png?resizew=408)
(Ⅰ)求证:AE⊥平面CDE;
(Ⅱ)求证:FG∥平面BCD;
(Ⅲ)在线段AE上找一点R,使得平面BDR⊥平面DCB, 并说明理由.
您最近一年使用:0次
2016-12-03更新
|
861次组卷
|
3卷引用:陕西省西安市航天城第一中学2020-2021学年高一上学期期末数学试题
陕西省西安市航天城第一中学2020-2021学年高一上学期期末数学试题2014-2015学年北京市第六十七中学高二上学期期中练习理科数学试卷(已下线)第十三章 立体几何初步(压轴题专练)-单元速记·巧练(苏教版2019必修第二册)
8 . 下列条件中,能判断两个平面平行的是
A.一个平面内有无数条直线平行于另一个平面 |
B.一个平面内有两条直线平行于另一个平面 |
C.一个平面内有两条相交直线平行于另一个平面 |
D.两个平面同时垂直于另一个平面 |
您最近一年使用:0次
9 . 如图,棱锥
的底面
是矩形,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/ff98749f-f3cc-4026-9932-8d679f99f1ff.png?resizew=140)
(1)求证:
平面
;
(2)求二面角
的大小;
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46571701ccaa18d3c844ab99ee6c30e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/ff98749f-f3cc-4026-9932-8d679f99f1ff.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d9f756419912dd298a0d6857130c80.png)
您最近一年使用:0次
2016-12-04更新
|
475次组卷
|
5卷引用:2015-2016学年陕西省黄陵中学高二上学期期末考试理科数学试卷
10 . 设
为空间两条不同的直线,
为空间两个不同的平面,给出下列命题:
①若
,则
;
②若
,则
;
③若
,则
;
④若
,则
.
其中的正确命题序号是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d062fb1c47c0ff122146d4f0052744e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de666db0febae223cc4d1dc189d71ca6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae66e1b331446a43988ff0ae4f10e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73552465f894573a9147f9a81779b5be.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6265bccc7219c8f50f954efc3c1904e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262733e3d121027ade189a7a352b955e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf8c87a51dbea25bf26d17f66359b66.png)
其中的正确命题序号是
A.③④ | B.②④ | C.①② | D.①③ |
您最近一年使用:0次