解题方法
1 . 2023年5月30日,搭载神舟十六号载人飞船的长征二号F遥十六运载火箭在酒泉卫星发射中心成功发射.实验中学某班为弘扬“载人航天精神——特别能吃苦、特别能战斗、特别能攻关、特别能奉献”,举行航天知识问答活动.活动分为A、B两类项目,该班级所有同学均参加活动,且每位同学只能选择一项活动参加.活动参加情况如下表:
已知从该班级中随机抽取两位同学,在抽取到男同学和女同学各一位的前提下,两位同学均选择
类项目的概率为
.
(1)求
;
(2)判断是否有
的把握认为同学选择项目的类别与其性别有关?
附:
,
.
|
| |
男同学 | 25 | 15 |
女同学 | 10 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a954eb4370c2aa523f327bf1e6a5e2f7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)判断是否有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a363cc53497fdfac77b43f656424f973.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f8ec200973736ac8bcd9aa633855d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.050 | 0.010 | 0.001 |
![]() | 3.841 | 6.635 | 10.828 |
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2023-12-15更新
|
252次组卷
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2卷引用:江西省上饶市广丰一中2023-2024学年高二上学期12月月考数学试题
名校
解题方法
2 . 如图,在四棱锥
中,
平面
,
,E是棱PB上一点.
(1)求证:平面
平面PBC;
(2)若E是PB的中点,求平面PDC和平面EAC的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba19f2665ee328ad302a53fc014886fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/d7f74f79-3a9d-419a-ab8c-16386fdaff9b.png?resizew=147)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677d1863ff4d8ac1604b18149d4f320f.png)
(2)若E是PB的中点,求平面PDC和平面EAC的夹角的余弦值.
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2023-12-15更新
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7卷引用:江西省宜春市万载中学2023-2024学年高二上学期第二次月考数学试题(A卷)
3 . 如图,长方体
的底面
是正方形,点
在棱
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/bfd77a66-af5d-41ae-9328-e7a3a4bcf9ff.png?resizew=111)
(1)证明:
平面
;
(2)若
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c810d9d154dbbc0cef6ab8ffcd488045.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/bfd77a66-af5d-41ae-9328-e7a3a4bcf9ff.png?resizew=111)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f474f2c144be8703517ef72b98a7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7956d36499b97a127c725e10bc58fca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38796cb472afc2854224cd4d3254640.png)
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4 . 已知圆
过点
,且与直线
相切于点
.
(1)求圆C的方程;
(2)若
、
在圆
上,直线
,
的斜率之积为
,证明:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eb18bd9c658b727ea362cd4a5186e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcaada7649455fbebcdbdbb9a94e6a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f54dd475ff1321041c80738b201c3b6.png)
(1)求圆C的方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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2卷引用:江西省上饶市广丰中学2023-2024学年高二上学期12月月考数学试题
2023·全国·模拟预测
名校
解题方法
5 . 如图,已知四边形
与
均为直角梯形,平面
平面EFAD,
,
,
为
的中点,
.
(1)证明:
,
,
,
四点共面;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de83e135bbaf11ac4ce9d142ce18f30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345b28a81ff3d2c4666ee945a426fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c84fc6feba5f2d0fea8869bb8ece1043.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/f79857c5-a252-4dee-bc3c-2de2598ed3b3.png?resizew=159)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/ac047e91852b91af639feec23a9598b2.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
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6 . 已知椭圆
的左、右焦点分别为
,
,长轴的左、右端点分别为
,
,短轴的上、下端点分别为
,
,设四边形
的面积为S,且
.
(1)求
,
的值;
(2)过点
作直线
与
交于
,
两点(点
在
轴上方),求证:直线
与直线
的交点
在一条定直线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6939353e2387477b4149848a2818e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc42863b519330c6756b8927e868e09d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb85d28f8bdeedad66fd7ec2a561455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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2023-12-15更新
|
389次组卷
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2卷引用:江西省宜春市丰城拖船中学2023-2024学年高二上学期期中数学试题
7 . 如图,四棱柱ABCD﹣A1B1C1D1的底面ABCD为直角梯形,∠DAB=∠ADC=90°,AB=AD=1,CD=2,BD1⊥CD.点M为CD1的中点,且CD1=2BM.
(1)证明:平面BDM⊥平面BCD1;
(2)若钝二面角B﹣DM﹣C的余弦值为
,当BD1>BD时,求直线
与平面BCD夹角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/e881b15e-590a-409a-bfc4-703b8fb5bf28.png?resizew=192)
(1)证明:平面BDM⊥平面BCD1;
(2)若钝二面角B﹣DM﹣C的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021982f282a6cb554032f666c42a432d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554b3b4c5ce7aca81becc07ed4903736.png)
您最近一年使用:0次
名校
8 . (1) 设
都是正数,试证明不等式:
;
(2)对一切正整数
,不等式
恒成立,求实数
的取值范围构成的集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d66530037e9ad08b11dfe515571f41.png)
(2)对一切正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6489fd62b55ca837e35a3224c44c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
名校
9 . 如图,在四棱锥
中,
,
为棱
的中点,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/9713e9a8-e671-4486-a792-ff32cf54aa77.png?resizew=158)
(1)证明:
平面
;
(2)若直线PB与平面
的夹角为
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c8673c9eec822709d1c620f4d228b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a334a3bb901d3c3220f6824330cf352e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/9713e9a8-e671-4486-a792-ff32cf54aa77.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9068f29d671d76d1e95ba3a4eaff5b96.png)
(2)若直线PB与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b69099d2b74ffbb1f365e1468bd8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6a0cee8226e82cc57916e10d533369.png)
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名校
10 . 甲,乙两学校进行体育比赛,比赛共设两个项目,每个项目胜方得
分,负方得
分,平局各得
分.两个项目比赛结束后,总得分高的学校获得冠军.已知甲学校在两个项目中获胜的概率分别为
,
,甲学校在两个项目中平局的概率分别为
,
.各项目的比赛结果相互独立.
(1)求甲学校两场比赛后获得冠军的概率;
(2)用
表示甲学校两场比赛的总得分,求
的分布列与期望.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29be23f689eb01e57963495377501257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5db9fa0bc36e2308bd3eecd5e78351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4646418552dc060ebda1232361a01295.png)
(1)求甲学校两场比赛后获得冠军的概率;
(2)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
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566次组卷
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5卷引用:江西省宜春市万载中学2023-2024学年高二上学期第二次月考数学试题(A卷)
江西省宜春市万载中学2023-2024学年高二上学期第二次月考数学试题(A卷)(已下线)人教B版2019选择性必修第二册综合测试-2023-2024学年高二数学同步精品课堂(人教B版2019选择性必修第二册)湖北省腾●云联盟2024届高三上学期12月联考数学试题(已下线)第10讲 离散型随机变量的均值与方差-【寒假预科讲义】2024年高二数学寒假精品课(人教A版2019)河南省焦作市博爱县第一中学2023-2024学年高二上学期期末数学试题