1 . 如图,四棱锥
,侧面
是边长为
的正三角形,且与底面垂直,底面
是
的菱形,
为
的中点.
(1)求证:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051f092cbf89536d7e8b9fbf9d49355d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352d85caf2bd9c6c66709d09df0ee0ac.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c745df4f226027778d5fe45b6501b822.png)
![](https://img.xkw.com/dksih/QBM/2017/5/17/1689146393174016/1689201675509760/STEM/02c33f918e184aedb723f2984dd0e630.png?resizew=231)
您最近一年使用:0次
2016-12-03更新
|
1530次组卷
|
7卷引用:2015届吉林省实验中学高三上学期第五次模拟考试文科数学试卷
11-12高二上·浙江杭州·期末
2 . 如图,在三棱柱
中,
侧面
,已知
,
,
.
![](https://img.xkw.com/dksih/QBM/2012/7/16/1570926421106688/1570926426349568/STEM/e4033190d0664822978de2c67382f98f.png?resizew=230)
(1)求证:
平面
;
(2)试在棱
(不包含端点
上确定一点
的位置,使得
;
(3)在(2)的条件下,求二面角
的平面角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f98daab2b277b67e14454772d3e0d3fd.png)
![](https://img.xkw.com/dksih/QBM/2012/7/16/1570926421106688/1570926426349568/STEM/e4033190d0664822978de2c67382f98f.png?resizew=230)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ad7c180d6d084ecb25f23cb6fe9b10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)试在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e5090124abbafa4601c9b7b2c942c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7fda523ada8989e466d797b6fcd2e0.png)
(3)在(2)的条件下,求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69cbd2557ef69775b5a883c510091985.png)
您最近一年使用:0次
3 . 如图
,在直角梯形
中,
,
,
,
,
是
的中点,
是
与
的交点.将
沿
折起到
的位置,如图
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/e0a9da5e-235d-4a1d-a7e5-a591fd0540d9.png?resizew=349)
(Ⅰ)证明:
平面
;
(Ⅱ)若平面
平面
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4a1dc86ec008a976874c72f84c45c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3686ba2753cca5dccff70abad106c17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ee16b647a43fb8f1a6fd783332de591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d47e517548299563cc6c59c18f1922e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3a10d70387f6869cf373d4ddcb4388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e1b2df25efcb6812f4ad70e9cd1d731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfac8dafd800b1af4dc1ab93fe2ae25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97e22c9dd88a2510de9e5a309191934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27eb30fb48f7caa4ddaaf684c510174a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9951541de959397134935771464d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a593a37775b93b71fbfbb3e630da9c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9951541de959397134935771464d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965c2891871e9b91a55632305095baad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/e0a9da5e-235d-4a1d-a7e5-a591fd0540d9.png?resizew=349)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0424f2be274a33afdc7a06dc9f5857f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1c47b70b215b69b17ebd51e461ddb5.png)
(Ⅱ)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc24181bebd7f9b505e676af5d1d92b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c46725867ca1b2dceda2f4682abbf4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef31abd726dbdf7863665b257be903b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a1d124dfa23f2d2953997a04d72736.png)
您最近一年使用:0次
2016-12-03更新
|
7360次组卷
|
38卷引用:2015-2016学年吉林省吉林市五十五中高二上学期期末理科数学试卷
2015-2016学年吉林省吉林市五十五中高二上学期期末理科数学试卷吉林省通化市梅河口市第五中学2021-2022学年高二上学期期中数学试题2015年全国普通高等学校招生统一考试理科数学(陕西卷)2015-2016学年四川省资阳市高二上学期期末质量检测理科数学试卷2016届广西来宾高中高三5月模拟理科数学试卷2017届内蒙古杭锦后旗奋斗中学高三上入学摸底数学理试卷2017届山西右玉一中高三上期中数学(理)试卷贵州省遵义市航天高级中学2017-2018学年高二上学期第三次月考数学(理)试题内蒙古乌兰察布市北京八中分校2017-2018学年高二上学期期末考试数学(理)试题智能测评与辅导[理]-空间几何体的三视图、表面积、体积宁夏银川市宁夏大学附属中学2019-2020学年高三上学期第五次月考数学(理)试题2020届新疆库车县乌尊镇中学高三上学期月考数学(理)试题四川省泸州市泸县第五中学2019-2020学年高二下学期第二次月考数学(理)试题2020届广东省广州大学附属中学高三第一次模拟数学(理)试题人教A版(2019) 选择性必修第一册 必杀技 第一章 空间向量与立体几何 素养检测人教B版(2019) 选择性必修第一册 必杀技 第一章 空间向量与立体几何 素养检测江苏省无锡市江阴市2020-2021学年高三上学期开学检测数学试题安徽省六安市舒城中学2020-2021学年高二上学期第二次月考数学(理)试题(已下线)考点25 空间角与立体几何的综合应用-2021年新高考数学一轮复习考点扫描(已下线)专题47 空间向量与立体几何专题训练-2021年高考一轮数学(理)单元复习一遍过(已下线)专题47 空间向量与立体几何专题训练-2021年高考一轮数学单元复习一遍过(新高考地区专用)山西省实验中学2019届高三上学期第五次月考数学试题北师大版(2019) 选修第一册 必杀技 第三章 素养检测(已下线)专题1.12 空间向量与立体几何全章综合测试卷-2021-2022学年高二数学举一反三系列(人教A版2019选择性必修第一册)黑龙江省农垦宝泉岭高级中学2021-2022学年度高二学年上学期第一次月考数学试题黑龙江省佳木斯市第一中学2021-2022学年高三上学期第四次调研考试理科数学试题黑龙江省佳木斯市第二中学2021-2022学年高三第三次月考数学(理)试题(已下线)专题24 盘点立体几何中折叠问题——备战2022年高考数学二轮复习常考点专题突破章节综合测试-空间向量与立体几何陕西省西安市2022-2023学年高二上学期第二次考试理科数学试题江西省南昌市第二中学2022-2023学年高二上学期第二次月考数学试题黑龙江省哈尔滨市第一中学校2022-2023学年高三上学期期中数学试题河南省南阳市第五中学校2022-2023学年高二上学期第二次月考数学试题广西玉林市陆川县实验中学2022-2023学年高二上学期期中联考数学试题(已下线)专题24 空间向量与空间角的计算-十年(2011-2020)高考真题数学分项四川省成都市第十七中学2020-2021学年高二上学期期中考试理科数学试题湖南省长沙市同升湖高级中学2022-2023学年高二下学期数学期中模拟卷(已下线)模块一 专题2 B 空间向量的应用提升卷 期末终极研习室高二人教A版
真题
名校
4 . 如图,在四棱锥
中,
平面
,底面
是菱形,
,
.
![](https://img.xkw.com/dksih/QBM/2018/6/25/1975123199098880/2009033766846464/STEM/081dd6d66c6140d8b2c56f6059ecc712.png?resizew=201)
(
)求证:
平面
.
(
)若
,求
与
所成角的余弦值.
(
)当平面
与平面
垂直时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://img.xkw.com/dksih/QBM/2018/6/25/1975123199098880/2009033766846464/STEM/081dd6d66c6140d8b2c56f6059ecc712.png?resizew=201)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
您最近一年使用:0次
2016-11-30更新
|
3507次组卷
|
11卷引用:2011-2012学年吉林省吉林一中高二上学期质量检测理科数学
(已下线)2011-2012学年吉林省吉林一中高二上学期质量检测理科数学2011年普通高中招生考试北京市高考理科数学(已下线)2011-2012学年山东省济宁市鱼台二中高二上学期期末考试理科数学(已下线)2013-2014学年河北衡水中学高二上第四次调研考试理数学卷2015届福建省三明市一中高三上学期第二次月考理科数学试卷2015-2016学年四川省成都七中实验学校高二上学期期中文科数学试卷河北省武邑中学2017届高三下学期一模考试数学(理)试题北京市石景山第九中学2017-2018高二上期中试卷 北师大版 数学(理科)上海市普陀区曹杨二中2017-2018学年度高二上学期12月月考数学试题人教B版(2019) 选择性必修第一册 过关斩将 第一章 空间向量与立体几何 1.2 空间向量在立体几何中的应用 1.2.2 空间中的平面与空间向量陕西省咸阳市实验中学2020-2021学年高二上学期第三次月考数学(理)试题
2010·吉林·模拟预测
5 . 如图,在直三棱柱
中,
,
是棱
上的动点,
是
中点,
,
.
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641778176/STEM/8e9eecba6513410482e450e02f26ebf4.png)
(Ⅰ)求证:
平面
;
(Ⅱ)若二面角
的大小是
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405d4e4b1755e82269bb95b1e1a44d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.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/2015/12/14/1572355636092928/1572355641778176/STEM/a5a6e77feb5e473ab2b2ce89b4d4f7e3.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641778176/STEM/66682a872f674602a8b3e63452f21cee.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641778176/STEM/8e9eecba6513410482e450e02f26ebf4.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f11e5b3ebac5f333e53ba46fb88f7fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd06851d747f8ccf046bc807b2523e65.png)
(Ⅱ)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c09b75b6951958234d879ac6d4d7bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6fdfbf0ea031149dd4a8f8235fae73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
6 . 如图,长方体
中,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/22759c45bb6d4ea096ae8bc38c0f7de1.png)
(1)求证:直线
∥平面
;
(2)求证:平面![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/6d12fbc5e916426bb67f7267cc80a2bd.png)
平面
;
(3)求证:直线![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/ef40f6a3dc374c07aae0217dce1b4da3.png)
平面
.
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/5b2fb361a31a4516ae2e03e84c0baa30.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/3d9981b93bca4354acf1162f81c66992.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/7d1504a55c154bf3a99275ab9715f1dc.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/3b56de4c9c344aa1b0c39c7fee40124c.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/9f3d22d3d1a147e39aa623b8535aa6aa.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/22759c45bb6d4ea096ae8bc38c0f7de1.png)
(1)求证:直线
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/f214e4ffb71f448c9e5b47e75c41eb4f.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/6d12fbc5e916426bb67f7267cc80a2bd.png)
(2)求证:平面
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/6d12fbc5e916426bb67f7267cc80a2bd.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/0796148345294334b0906da905790296.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/ce242d31db184c66bb56c4f8db657a58.png)
(3)求证:直线
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/ef40f6a3dc374c07aae0217dce1b4da3.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/0796148345294334b0906da905790296.png)
![](https://img.xkw.com/dksih/QBM/2013/1/24/1571107409387520/1571107414958080/STEM/6d12fbc5e916426bb67f7267cc80a2bd.png)
您最近一年使用:0次
解题方法
7 . 如图,在多面体
中,
平面
,
,且
是边长为
的等边三角形,
,
与平面
所成角的正弦值为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/77c9ba67-d20a-48d5-bd03-c4177c171a50.png?resizew=136)
(Ⅰ)若
是线段
的中点,证明:
面
;
(Ⅱ)求多面体
的体积.
![](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/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c922ecf60196206fb1c6e7f0bcf15e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa42621cd6793e7f3673fdb49bc3123.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/77c9ba67-d20a-48d5-bd03-c4177c171a50.png?resizew=136)
(Ⅰ)若
![](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)
(Ⅱ)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
您最近一年使用:0次
名校
8 . 如图,在多面体
中,
平面
,
,且
为等边三角形,
,
与平面
所成角的正弦值为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/2437134e-1d14-40e0-a2dd-a774fa303569.png?resizew=179)
(1)若
是线段
的中点,证明:
平面
;
(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/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51af40dd53159814a041f9db4c370565.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093d4a4bba19f681dc21930fdf341f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa42621cd6793e7f3673fdb49bc3123.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/2437134e-1d14-40e0-a2dd-a774fa303569.png?resizew=179)
(1)若
![](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
2016-12-04更新
|
701次组卷
|
3卷引用:2016届吉林省吉大附中高三上第一次摸底考试理科数学试卷
9 . 如图,三棱锥
中,
平面
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/339b2bc8-4687-4fe4-9be1-cfa3e76711a3.png?resizew=160)
,
,
.
分别为线段
上的点,且
.
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/339b2bc8-4687-4fe4-9be1-cfa3e76711a3.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be41b05e11ba5eadaaed9a224b949774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba5383e768dc86e1bfd79c10f96f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72dd63ce9da2daea88686aac5723b1ad.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e867e5c7ef4da37d8985ce82022060e.png)
您最近一年使用:0次
2016-12-03更新
|
7615次组卷
|
29卷引用:2015-2016学年吉林省扶余市一中高二上学期期末考试理科数学试卷
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