2011·北京西城·一模
1 . 如图,
是边长为
的正方形,
平面
,
,
,
与平面
所成角为
.
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/c2dd45c4ba1646c69e090be9382caaf5.png)
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的余弦值;
(Ⅲ)设点
是线段
上一个动点,试确定点
的位置,使得
平面
,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/fe701b53575443c292db4d872e40ef05.png)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/2a3e33d681e842f8b71707d3b573487c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05638d82225327da27e5f916d2d4e747.png)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/fe701b53575443c292db4d872e40ef05.png)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/4ff673aaecc44d63acbd5c98d6eac0a3.png)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/527f9ac3d51e4280b1e8f14331835f42.png)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/b0a0b01103ed4e7b9373b12fcb75fef5.png)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/fe701b53575443c292db4d872e40ef05.png)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/7ae9bad96345493fb94386207d35553e.png)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/c2dd45c4ba1646c69e090be9382caaf5.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/599b63c003aeb99d777e87182db8f019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(Ⅱ)求二面角
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572241494597632/1572241500585984/STEM/8162eff6ad1c42db89028790e9e2fb4f.png)
(Ⅲ)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
2 . 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
|
2775次组卷
|
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)
3 . 如图,正方形
与梯形
所在的平面互相垂直,
,
,
,
,
为
的中点.
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/30/27396d36-39a5-417e-a0a1-bbd7128408ec.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2061b9ab3862d9c36d32c4ffef91145a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3547a914468b082d8d8741b974a03190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
您最近一年使用:0次
2016-12-03更新
|
2290次组卷
|
5卷引用:2011届北京市东城区高三上学期期末理科数学卷
4 . 如图所示,正方体
的棱长为1,
分别是棱
,
的中点,过直线
的平面分别与棱
、
分别交于
两点,设
,
,给出以下四个结论:
![](https://img.xkw.com/dksih/QBM/2015/8/27/1572225637851136/1572225643413504/STEM/c629f8aa5a554eeb8d820f1bd4c973d3.png?resizew=180)
①平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
平面
;
②直线
∥平面
始终成立;
③四边形
周长
,
是单调函数;
④四棱锥
的体积
为常数;
以上结论正确的是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a99be053c95aefbebe7460e50df572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24963d5acbbdcd6e15c2db04002e0909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e748663b134c6161ad31b4a279440cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f022b18f3b30bccee515df5e47ff00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487d2cbe0b55fd0de98af4725b988d39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f2a9b923a355694ea487f6c5669a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1376168658dbe7f5b7f4d75fb1db545a.png)
![](https://img.xkw.com/dksih/QBM/2015/8/27/1572225637851136/1572225643413504/STEM/c629f8aa5a554eeb8d820f1bd4c973d3.png?resizew=180)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc21c182d284d0a028210baa4dea49.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
③四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80310a4c50d1164cdeaf37b2f1f2791b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1376168658dbe7f5b7f4d75fb1db545a.png)
④四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf43f974932cc0d83c0e898a4f00a72b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b11baa5184a3f07f167cc328f1abf1.png)
以上结论正确的是
您最近一年使用:0次
2015-08-27更新
|
2049次组卷
|
2卷引用:2014-2015学年江西省抚州市七校高一下学期期末联考数学试卷