名校
1 . 如图所示,四棱锥
的底面是梯形,且
,
平面
,
是
中点,
.
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572913435418624/1572913441038336/STEM/31381705-a1e7-4634-afe2-ce70a179c2b8.png?resizew=178)
(Ⅰ)求证:
平面
;
(Ⅱ)若
,
,求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b41b89ccb8296f8195f84832995d52dd.png)
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572913435418624/1572913441038336/STEM/31381705-a1e7-4634-afe2-ce70a179c2b8.png?resizew=178)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df003447e98fd5ba9badd42177f345db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
您最近一年使用:0次
2016-12-04更新
|
1396次组卷
|
5卷引用:2016届吉林省毓文中学高三高考热身考试理科数学试卷
2 . 如图,在三棱柱
-中,
,
,
,
在底面
的射影为
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143291596800/1572143297462272/STEM/ca9589b5-fb94-4b05-adce-46a75f3aa737.png?resizew=214)
(1)证明:
D
平面
;
(2)求二面角
-BD-
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8e9ec412ea0355e4e5cd06c60e5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1880586c33da315e49ccb6e2d531c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143291596800/1572143297462272/STEM/ca9589b5-fb94-4b05-adce-46a75f3aa737.png?resizew=214)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02831149d08a249bb36f006020a76b86.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
您最近一年使用:0次
2016-12-03更新
|
6267次组卷
|
14卷引用:2016届吉林四平一中高三五模理科数学试卷
2016届吉林四平一中高三五模理科数学试卷2015年全国普通高等学校招生统一考试理科数学(浙江卷)广东省华南师范大学附属中学2017-2018学年高二10月月考数学(理)试题第二章 高考链接(二)(已下线)专题12 点线面的位置关系与空间的角-2021年浙江省高考数学命题规律大揭秘【学科网名师堂】辽宁省沈阳市第二十中学2021-2022学年高三上学期期末数学试题浙江省北斗联盟2021-2022学年高二下学期期中联考数学试题广东省五校(广州市第二中学等)2021-2022学年高一下学期期末联考数学试题(已下线)期末复习07 空间几何线面、面面垂直-期末专项复习河北省唐县第一中学2022-2023学年高二下学期3月月考数学试题(已下线)高二上学期期中【常考60题考点专练】(选修一全部内容)-2022-2023学年高二数学考试满分全攻略(人教A版2019选修第一册)(已下线)第七章 应用空间向量解立体几何问题拓展 专题一 立体几何非常规建系问题 微点1 立体几何非常规建系问题(一)【培优版】(已下线)专题23 立体几何解答题(理科)-2专题31立体几何与空间向量解答题(第二部分)