1 . 在四棱锥
中,
,
是
的中点,面
面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532be45e89f749555474a07d3d6b6131.png)
![](https://img.xkw.com/dksih/QBM/2019/7/11/2244715597807616/2244789789982720/STEM/8af1170976c344a1aeb3ec1fe4627129.png?resizew=146)
(1)证明:
面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c762086e5ba072fc253a26a7ad8b9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e807f0df6c64acb0f89e7c7997384286.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/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532be45e89f749555474a07d3d6b6131.png)
![](https://img.xkw.com/dksih/QBM/2019/7/11/2244715597807616/2244789789982720/STEM/8af1170976c344a1aeb3ec1fe4627129.png?resizew=146)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d30788a482598e638aea779ac14da12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49fa81977be2f5c93f46d4032129477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bf87f74420270138ed73a2d38ca48.png)
您最近一年使用:0次
2017-05-18更新
|
362次组卷
|
7卷引用:安徽省六安市舒城中学2018-2019学年高二下学期期末数学(理)试题
2 . 在正方体
中(如图),已知点
在直线
上运动,则下列四个命题:
①三棱锥
的体积不变;
②直线
与平面
所成的角的大小不变;
③二面角
的大小不变;
④
是平面
上到点
和
距离相等的点,则
点的轨迹是直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
其中真命题的编号是__________ .(写出所有真命题的编号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad99ef5e70de37345c708b758d545f.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
③二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67094912ebf6dd7b27b835af55df4826.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
其中真命题的编号是
您最近一年使用:0次
2017-02-23更新
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1089次组卷
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8卷引用:安徽省芜湖市第一中学2020-2021学年高二上学期10月第二轮月考理科数学试题
安徽省芜湖市第一中学2020-2021学年高二上学期10月第二轮月考理科数学试题2016-2017学年浙江省名校协作体高二下学期考试数学试卷浙江省杭州市名校协作体2016-2017学年高二下学期月考数学试题河北省衡水中学2016-2017学年高一下学期期中考试数学(理)试题黑龙江省佳木斯市第一中学2016-2017学年高一下学期期末考试数学试题(已下线)微专题13 轻松搞定立体几何的轨迹问题(已下线)结业测试卷(范围:第六、七、八章)(提高篇)-【寒假预科讲义】(人教A版2019必修第二册)(已下线)重难点专题11 轻松搞定立体几何的轨迹问题-【帮课堂】(苏教版2019必修第二册)
名校
3 . 如图,在三棱锥
中,
,
,
,
,
,且
在平面
上的射影
在线段
上.
![](https://img.xkw.com/dksih/QBM/2017/1/21/1619482025304064/1619482025803776/STEM/c2090b84399a480e8275e868e7c12b5d.png)
(Ⅰ)求证:
;
(Ⅱ)设二面角
为
,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3f74153816d0a7733bc9c91282e75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324652e745c7c42d5d2635fe66138dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2017/1/21/1619482025304064/1619482025803776/STEM/c2090b84399a480e8275e868e7c12b5d.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51b89f545616ef48f3706850107ad95.png)
(Ⅱ)设二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3701f73add38ffeb06fb42fef55fd533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
2017-02-08更新
|
1014次组卷
|
6卷引用:安徽省合肥市第八中学2020-2021学年高二上学期第一次段考理科数学试题
解题方法
4 . 在多面体
中,
,
,
平面
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/3/10/1572530603417600/1572530609668096/STEM/42dd0673c3b84186a58e51ffa563a7f6.png?resizew=194)
(Ⅰ)求证:
平面
;
(Ⅱ)若
,求二面角
的平面角正切值的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5a4bf8028cee9396367b68ea8e6f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936c74c9a7edc81c037f4ea795d130bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/10/1572530603417600/1572530609668096/STEM/42dd0673c3b84186a58e51ffa563a7f6.png?resizew=194)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073a88b42836fb88433679932b48ad03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474b9ae5b7ff355c6b74332d68eeb8e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aad963ee7cdc7ff35a8dd23685589d1.png)
您最近一年使用:0次
13-14高二上·安徽池州·期中
解题方法
5 . 在直角坐标系
中,设A(-2,3),B(3,-2),沿
轴把直角坐标平面折成大小为
的二面角后,这时
则
的大小为_____
![](https://img.xkw.com/dksih/QBM/2010/4/12/1569696237862912/1569696242737152/STEM/f55b2c0f5c304b80b286b8233ca6f32b.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2010/4/12/1569696237862912/1569696242737152/STEM/5a63a970d866492882c11672eafb70fb.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2010/4/12/1569696237862912/1569696242737152/STEM/8607f1df26304d6dbb0b13d085ac500c.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2010/4/12/1569696237862912/1569696242737152/STEM/a30a481925264639ae5f23511378ad0c.png?resizew=81)
![](https://img.xkw.com/dksih/QBM/2010/4/12/1569696237862912/1569696242737152/STEM/8607f1df26304d6dbb0b13d085ac500c.png?resizew=13)
您最近一年使用:0次
12-13高一上·安徽安庆·期末
6 . 已知二面角
的平面角是锐角
,
内一点
到
的距离为3,点C到棱
的距离为4,那么
的值等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ce3f859c6b9a0cfc98bdf5b3d0f395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43660b1543b3a2b46185f7629d28a963.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-09-08更新
|
408次组卷
|
5卷引用:安徽省宿州市十三所省重点中学2019-2020学年高二上学期期中联考数学(理)试题
安徽省宿州市十三所省重点中学2019-2020学年高二上学期期中联考数学(理)试题安徽省宿州市十三所省重点中学2019-2020学年高二上学期期中联考数学(文)试题(已下线)2011-2012学年安徽省桐城十中高一上学期期末考试数学试卷(已下线)2013-2014学年四川成都双流棠湖中学高二12月月考文数学卷2015-2016学年浙江金华等三市部分学校高二下学期期中数学试卷
11-12高二上·安徽·期末
名校
7 . 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年安徽省毫州市高二上学期期末考试数学理卷
(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)2011-2012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)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)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(已下线)2011届湖北省黄冈中学高三5月模拟考试文科数学
8 . 如图,在直三棱柱ABC-A1B1C1中.∠ BAC=90°,AB=AC=AA1 =1.D是棱CC1上的一点,P是AD的延长线与A1C1的延长线的交点,且PB1∥平面BDA.
(I)求证:CD=C1D:
(II)求二面角A-A1D-B的平面角的余弦值;
(Ⅲ)求点C到平面B1DP的距离.
(I)求证:CD=C1D:
(II)求二面角A-A1D-B的平面角的余弦值;
(Ⅲ)求点C到平面B1DP的距离.
![](https://img.xkw.com/dksih/QBM/2011/6/15/1570238676590592/1570238681956352/STEM/eb749ad7d68147aba6b00c1d6ab87276.png?resizew=261)
您最近一年使用:0次
2016-11-30更新
|
1435次组卷
|
5卷引用:2011-2012学年安徽省蚌埠铁中高二上学期期中考试理科数学
9 . 某设计部门承接一产品包装盒的设计(如图所示),客户除了要求
、
边的长分别为
和
外,还特别要求包装盒必需满足:①平面
平面
;②平面
与平面
所成的二面角不小于
;③包装盒的体积尽可能大.
若设计部门设计出的样品满足:
与
均为直角且
长
,矩形
的一边长为
,请你判断该包装盒的设计是否能符合客户的要求?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0731be9fc9a06a97db4857ccd2240772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe872314b0398e8bbc7949f8288271a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
若设计部门设计出的样品满足:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0731be9fc9a06a97db4857ccd2240772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec346cba41b378fcd97f1607835e259a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe872314b0398e8bbc7949f8288271a.png)
![](https://img.xkw.com/dksih/QBM/2011/6/2/1570230713344000/1570230718922752/STEM/b0fb76493f3e44b0b55b79aae71af8ac.png?resizew=156)
您最近一年使用:0次
2016-11-30更新
|
1265次组卷
|
4卷引用:安徽省池州市东至县第二中学2020-2021学年高二下学期4月期中理科数学试题