1 . 如图,四边形
与
都是边长为
的正方形,点
是
的中点,
平面
.
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)求平面
与平面
所成锐二面角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5908f70a0cede2e2c2da6599b7f0aae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986a0d8f37177dcccfee3898a66fd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe312c442d13f937a286c0ed069d6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaeef6e3857afecc552d92aa45296dac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245a7f78d110342d3a67522656a5146f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2017/11/21/1822107688427520/1823472728915968/STEM/5627aec5fc014acda0213ac475931ab3.png?resizew=175)
您最近一年使用:0次
2 . 如图,矩形
中,
,
,
在
边上,且
,将
沿
折到
的位置,使得平面
平面
.
(Ⅰ)求证:
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.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/68696b781af2609327222d22cb7bab3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b348d4333ecdfc3e3b1ba16dc312550d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced76e1ee551955a877688618b1f4ad.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5a101bb92bd721e35acc7023154b44.png)
![](https://img.xkw.com/dksih/QBM/2017/4/18/1668561570709504/1668648730017792/STEM/cd7d6f1167504c9eb741ff615f56b857.png?resizew=149)
您最近一年使用:0次
2017-04-18更新
|
2056次组卷
|
5卷引用:广东省佛山市荣山中学2019-2020学年高二上学期期中数学试题
12-13高二上·湖南长沙·期末
名校
解题方法
3 . 如图,在底面为直角梯形的四棱锥P-ABCD中,AD∥BC,∠ABC=90°,PA⊥平面ABCD,PA=3,AD=2,AB=2
,BC=6.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
您最近一年使用:0次
2018-07-21更新
|
830次组卷
|
8卷引用:广东省兴宁市第一中学2020届高三上学期期中段考数学(理)试题
广东省兴宁市第一中学2020届高三上学期期中段考数学(理)试题(已下线)2011-2012学年湖南省望城县第一中学高二上学期期末考试理科数学试卷(已下线)2012届江西省会昌中学高三上学期第一次月考理科数学试卷山东省莱州市第一中学高一必修2综合测试数学试题【全国百强校】内蒙古乌兰察布市集宁一中(西校区)2017-2018学年高二下学期期末考试数学(理)试题陕西省西安市西北工业大学附属中学2020-2021学年高二下学期期中理科数学试题广东省茂名市信宜市华侨中学2023-2024学年高二上学期第二次段考(1月)数学试题湖南省长沙市雅礼中学2022-2023学年高三上学期月考(三)数学试题
9-10高二下·广东湛江·期中
4 . 如图(1),
是等腰直角三角形,
,
、
分别为
、
的中点,将
沿
折起,使
在平面
上的射影
恰为
的中点,得到图(2).
![](https://img.xkw.com/dksih/QBM/2010/5/18/1569733419032576/1569733424390144/STEM/a5207847db6a40608dda4a185e0f60c7.png?resizew=346)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08313da7b66283d2e0b3987f3e6761f4.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/2010/5/18/1569733419032576/1569733424390144/STEM/a5207847db6a40608dda4a185e0f60c7.png?resizew=346)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19ababe609d278ce86b53a322a53624.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5e7d2837cbb6fdd35989ad7f7abed8.png)
您最近一年使用:0次
5 . 如图,在多面体
中,
平面
,且
是边长为2的等边三角形,
.
是线段
的中点,证明:直线
面
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c5ae16a7145a28a91d45ef950a07c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0968b39e8d3a5146759340413571d0d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69dc003d123423886dba10b28b10b3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d3f5f4c4419913c1232b7aae03ade.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db1d8f228c87b65a3609f825fc441d5.png)
您最近一年使用:0次
2016-12-03更新
|
1551次组卷
|
3卷引用:广州市岭南中学2017学年第一学期高三年级期中考试理科数学试题
11-12高二上·安徽·期末
名校
6 . 如图,在直三棱柱
中, AB=1,
,∠ABC=
.
(1 )证明:
;
(2)求二面角A—
—B的正切值.
![](https://img.xkw.com/dksih/QBM/2012/6/16/1570888444502016/1570888450097152/STEM/48cf4a2fa71c445989fbaebec855e8ef.png?resizew=96)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126a3d8d69d4623cefbd444020e92db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
(1 )证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba985fb50a9078a839b66bf1d1eadea9.png)
(2)求二面角A—
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/2012/6/16/1570888444502016/1570888450097152/STEM/3d414a2757f3451b826262fbd9c92e5d.png?resizew=220)
您最近一年使用:0次
2016-11-30更新
|
2349次组卷
|
8卷引用:2011-2012学年广东省执信中学高二下期中理科数学试卷
(已下线)2011-2012学年广东省执信中学高二下期中理科数学试卷(已下线)2011-2012学年山东省济宁市梁山一中高二下学期期中理科数学试卷(已下线)2011年安徽省毫州市高二上学期期末考试数学理卷(已下线)2011届湖北省黄冈中学高三5月模拟考试文科数学(已下线)2011-2012学年度陕西省西安市第一中学高二第一学期期末理科数学试卷(已下线)2015-2016学年陕西省西安市新东方高二提高班上学期期末理科数学卷【全国百强校】云南省玉溪第一中学2018-2019学年高二上学期第二次月考数学(理)试题福建省泰宁第一中学2018-2019学年高二上学期第二阶段考试数学(理)试题
9-10高二下·浙江舟山·期末
7 . 如图,四棱锥P-ABCD是底面边长为1的正方形,PD⊥BC,PD=1,PC=
.
![](https://img.xkw.com/dksih/QBM/2010/7/9/1569787955175424/1569787960082432/STEM/f88da4e81f0e41398b1de157b700c7d0.png)
(1)求证:PD⊥面ABCD;
(2)求二面角A-PB-D的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2010/7/9/1569787955175424/1569787960082432/STEM/f88da4e81f0e41398b1de157b700c7d0.png)
(1)求证:PD⊥面ABCD;
(2)求二面角A-PB-D的大小.
您最近一年使用:0次