1 . 如图,在三棱锥
中,
底面ABC,
,D是AB的中点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/3adce5b2-c55e-4bc0-93fc-b7dcb4c05e99.png?resizew=181)
(1)求证:平面
平面VCD;
(2)试确定角
的值,使得直线BC与平面VAB所成的角的为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d01592b7e10bf087d1465f9d6899bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc130e4f2499cc620a0df6542d8127b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f411d63f498747c00213e721f0b1856.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/3adce5b2-c55e-4bc0-93fc-b7dcb4c05e99.png?resizew=181)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8704811c9c5dba854310ae0de2ba6b05.png)
(2)试确定角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
您最近一年使用:0次
2022-11-10更新
|
474次组卷
|
2卷引用:2007年普通高等学校招生考试数学(文)试题(湖北卷)
真题
2 . 如图,在棱长为1的正方体
中,点
是棱
的中点,点
是棱
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/eeea1562-e961-4980-8af0-1158e9673483.png?resizew=168)
(1)试确定点
的位置,使得
平面
;
(2)当
平面
时,求二面角
的大小.(结果用反三角函数值表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/eeea1562-e961-4980-8af0-1158e9673483.png?resizew=168)
(1)试确定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da81a007b14af667599765c89d5b8530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a76f52ae3ef071a5084d09ec035c80c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da81a007b14af667599765c89d5b8530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a76f52ae3ef071a5084d09ec035c80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee61ae06b14a532dbb6b9d9850027a44.png)
您最近一年使用:0次
真题
解题方法
3 . 如图,在棱长为1的正方体
中,
与
交于点E,
与
交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/641afae2-8f44-442e-8139-9e7817f1d5e6.png?resizew=180)
(1)求证:
平面
;
(2)求二面角
的夹角余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](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/588eb9393564a33552c4b2e8de837ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/641afae2-8f44-442e-8139-9e7817f1d5e6.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864689852707154e3a9be79f657f16d4.png)
您最近一年使用:0次
真题
解题方法
4 . 如图,在四棱锥P﹣ABCD中,底面ABCD为矩形,侧棱PA⊥底面ABCD,
,BC=1,PA=2,E为PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/ddb0c508-6dae-45af-bebe-33ef359822c9.png?resizew=186)
(1)求cos
,
的值;
(2)在侧面PAB内找一点N,使NE⊥平面PAC,并求出N到AB和AP的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/ddb0c508-6dae-45af-bebe-33ef359822c9.png?resizew=186)
(1)求cos
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e919d17219963a339829ef40abb27c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2539f8013bd37c673ace5a22634ecc.png)
(2)在侧面PAB内找一点N,使NE⊥平面PAC,并求出N到AB和AP的距离.
您最近一年使用:0次
真题
解题方法
5 . 如图在三棱锥
中,
底面
,
,D是
的中点,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/9/24/2815037997817856/2815863124533248/STEM/fe47cba5-5eb6-45b5-bc8c-9d46a7ea8f75.png?resizew=283)
(1)求证:平面
平面
;
(2)当角
变化时,求直线
与平面
所成角的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d01592b7e10bf087d1465f9d6899bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc130e4f2499cc620a0df6542d8127b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9a6f47f3177e64408b4380beb55f79.png)
![](https://img.xkw.com/dksih/QBM/2021/9/24/2815037997817856/2815863124533248/STEM/fe47cba5-5eb6-45b5-bc8c-9d46a7ea8f75.png?resizew=283)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8704811c9c5dba854310ae0de2ba6b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cfd630472bc73bd8c2209376dbe9d1.png)
(2)当角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f526e2fe627bb4ddebe708c07d0a22fc.png)
您最近一年使用:0次
2021-09-25更新
|
321次组卷
|
2卷引用:2007年普通高等学校招生考试数学(理)试题(湖北卷)
真题
6 . 如图,在直三棱柱
中,平面
侧面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbaded41f8e0ea6865e1a28f76a3391.png)
(Ⅰ)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3283c73103f347a4807e126cd9b7839.png)
(Ⅱ)若
,直线AC与平面
所成的角为
,二面角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0491bd153df69218dc4ef97596535165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dee56b9f36ba8f76fe67b76383636b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbaded41f8e0ea6865e1a28f76a3391.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3283c73103f347a4807e126cd9b7839.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1bf0577579f91d46eaa154a8ae9b76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0491bd153df69218dc4ef97596535165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/0adc574b-3bf4-43e8-a672-29633029b530.png?resizew=139)
您最近一年使用:0次
2019-01-30更新
|
577次组卷
|
2卷引用:2008年普通高等学校招生全国统一考试数学文史类(湖北卷)
真题
解题方法
7 . 如图1,
,
,过动点A作
,垂足D在线段BC上且异于点B,连接AB,沿
将△
折起,使
(如图2所示).
(Ⅰ)当
的长为多少时,三棱锥
的体积最大;
(Ⅱ)当三棱锥
的体积最大时,设点
,
分别为棱
,
的中点,试在棱
上确定一点
,使得![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/785f2f8683dc48e5ae0a8a31bf9ddef1.png)
,并求
与平面
所成角的大小.
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/2de662dc22ec4613a048d2e8cc8300c6.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/a80c8f86e9214f89af7853d4c72660fc.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/60fec1158c744d15b96a66864f6c5ff0.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/df16839572e442b8ba72c66e3d616b76.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/45ee6e6bbdb74b7ca0d47df116dfcb8d.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/821cfd5eb3344dd08b90c36fead4da3f.png)
(Ⅰ)当
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/7218c336bb944816a0369ac1d1a17d9b.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/b17e35b62cd6405fb5beba207400333a.png)
(Ⅱ)当三棱锥
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/b17e35b62cd6405fb5beba207400333a.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/1686b97e1f124bc9923b6c8cb5fe3083.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/e383ce4b262e4b8b976c0f39a98efe37.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/fa538860e9104bf6a2b5210a2e55ae17.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/7b87a0397f6346d78e76ff10dff4a344.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/0293f304827b4abf92d686793086a5ab.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/7f8ab9f6a1f644a99ed93153058f10a8.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/785f2f8683dc48e5ae0a8a31bf9ddef1.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/c690d79140f8430cb5cc6d584e55c24a.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/7db0c0645965462ab5a90fdee4ad36ac.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924080128/STEM/b2f10a7a039a413c93f3640e9c176aa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/a28e0984-20c3-44e0-b03a-04c3a5872c0d.png?resizew=332)
您最近一年使用:0次
8 . 《九章算术》中,将底面为长方形且有一条侧棱与底面垂直的四棱锥称之为阳马,将四个面都为直角三角形的四面体称之为鳖臑.
如图,在阳马
中,侧棱
底面
,且
,过棱
的中点
,作
交
于点
,连接 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9239dd73df715a39ae6f3f69f14a92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/fdfbbd24-8548-41c1-8788-6c0994e50143.png?resizew=175)
(Ⅰ)证明:
.试判断四面体
是否为鳖臑,若是,写出其每个面的直角(只需写
出结论);若不是,说明理由;
(Ⅱ)若面
与面
所成二面角的大小为
,求
的值.
如图,在阳马
![](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/37e2267c84394668eff2e9f5918de4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9239dd73df715a39ae6f3f69f14a92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/fdfbbd24-8548-41c1-8788-6c0994e50143.png?resizew=175)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017797398acdf601fd6f40b1e20e8751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc50ecfa45216f8d098662452cf8d08.png)
出结论);若不是,说明理由;
(Ⅱ)若面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54625f5af5647c5dad88675510c4711b.png)
您最近一年使用:0次
2016-12-03更新
|
5775次组卷
|
32卷引用:2015年全国普通高等学校招生统一考试理科数学(湖北卷)
2015年全国普通高等学校招生统一考试理科数学(湖北卷)高中数学解题兵法 第八十七讲 立足基础、树上开花北京市第二中学2022届高三上学期期中考试数学试题(已下线)压轴题立体几何新定义题(九省联考第19题模式)练(已下线)第七章 应用空间向量解立体几何问题拓展 专题二 平面法向量求法及其应用 微点1 平面法向量求法及其应用(一)【基础版】(已下线)专题23 立体几何解答题(理科)-3浙江省绍兴市诸暨中学2019-2020学年高一(实验班)下学期期中数学试题浙江省宁波市六校联考2020-2021学年高二上学期期中数学试题(已下线)【新东方】高中数学20210323-001【高二上】(已下线)第一章 空间向量与立体几何(培优必刷卷)-2021-2022学年高二数学上学期同步课堂单元测试(人教A版2019选择性必修第一册)(已下线)专练9 专题强化练3-立体几何中的存在性与探究性问题-2021-2022学年高二数学上册同步课后专练(人版A版选择性必修第一册)(已下线)期中考试重难点专题强化训练(1)——向量的综合运用-2021-2022学年高二数学单元卷模拟(易中难)(2019人教A版选择性必修第一册+第二册)(已下线)上海市华东师范大学第二附属中学2021-2022学年高二上学期期中数学试题苏教版(2019) 必修第二册 一课一练 第13~15章综合检测(已下线)上海高二上学期期中【常考60题考点专练】(2)(已下线)上海高二上学期期中【易错、好题、压轴60题考点专练】(2)重庆市育才中学校2022-2023学年高一下学期期末数学试题(已下线)上海高二下学期期末真题精选(压轴60题35个考点专练)-【满分全攻略】2022-2023学年高二数学下学期核心考点+重难点讲练与测试(沪教版2020选修一+选修二)(已下线)第3章 空间向量及其应用(基础、常考、易错、压轴)分类专项训练(原卷版)(已下线)高二下期中真题精选(易错46题专练)-【满分全攻略】2022-2023学年高二数学下学期核心考点+重难点讲练与测试(沪教版2020选修一+选修二)辽宁省大连市第八中学2021-2022学年高二上学期期中考试数学试题辽宁省大连市第八中学2020-2021学年高二上学期9月月考数学试题(已下线)高一下期中真题精选(易错60题专练)-【满分全攻略】2022-2023学年高一数学下学期核心考点+重难点讲练与测试(人教A版2019必修第二册)湖南省常德市临澧县第一中学2023-2024学年高二上学期第一次阶段性考试数学试题辽宁省大连市大连王府高级中学有限公司2023-2024学年高二上学期10月月考数学试题湖南省张家界市民族中学2023-2024学年高二上学期第一次月考数学试题(已下线)第一章 空间向量与立体几何(压轴必刷30题4种题型专项训练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(人教A版2019选择性必修第一册)(已下线)期中真题必刷易错40题(17个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)(已下线)期末真题必刷压轴60题(22个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)(已下线)期末真题必刷易错60题(32个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)福建省莆田市第二中学2023-2024学年高二下学期返校考试数学试卷(已下线)上海市高二下学期期末真题必刷01(易错题)--高二期末考点大串讲(沪教版2020选修)
真题
9 . 如图,在棱长为2的正方体
中,
分别是棱
的中点,点
分别在棱
,
上移动,且
.
当
时,证明:直线
平面
;
是否存在
,使平面
与面
所成的二面角为直二面角?若存在,求出
的值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/31e0debe28b14f4b9b528ee8997ef660.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/050ec932667949a88859bc2a1e7df91b.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/24c5b5897e74432f8f6ffb23e5780a8a.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/af01c2520a77440e8403e30e18c5723e.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/a306f425b305408f88c99f0380bef7a8.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/8698f2c903ea4cf3af99dc55b9a311a4.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/a79d7b02119b4432a9ded40d88a281ed.png)
当
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/bdb99a01a3914d4eb2d59d5494d58bc9.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/516c1ee9330c430ea4494ef03d6824f9.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/6a056f212c454130a8714815d6a64aa5.png)
是否存在
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/1d14f11dc39641f19669750777723e0a.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/6a056f212c454130a8714815d6a64aa5.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/459801040bb2479caec1e3efaac428d5.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/1d14f11dc39641f19669750777723e0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/cfe4cfbb-cd3a-4a7f-b0ca-0d12b1496f29.png?resizew=214)
您最近一年使用:0次
10 . 如图,AB是圆O的直径,点C是圆O上异于A,B的点,直线PC⊥平面ABC,E,F分别是PA,PC的中点.
(1)记平面BEF与平面ABC的交线为l,试判断直线l与平面PAC的位置关系,并加以证明;
(2)设(1)中的直线l与圆O的另一个交点为D,且点Q满足
.记直线PQ与平面ABC所成的角为θ,异面直线PQ与EF所成的角为α,二面角E﹣l﹣C的大小为β.求证:sinθ=sinαsinβ.
(1)记平面BEF与平面ABC的交线为l,试判断直线l与平面PAC的位置关系,并加以证明;
(2)设(1)中的直线l与圆O的另一个交点为D,且点Q满足
![](https://img.xkw.com/dksih/QBM/2014/5/22/1571735197384704/1571735202594816/STEM/fe360ef4630f4137844de7807a4b52b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/29f8132e-d52b-4bb3-be15-39727acee098.png?resizew=195)
您最近一年使用:0次
2016-12-03更新
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2775次组卷
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4卷引用:2013年普通高等学校招生全国统一考试理科数学(湖北卷)