解题方法
1 . 如图,在三棱锥
中,PA⊥平面ABC,
,D,E,F分别是棱AB,BC,CP的中点,
.
(1)求直线PA与平面DEF所成角的正弦值;
(2)求点P到平面DEF的距离;
(3)求点P到直线EF的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3ae21f596c15f524719d68b617b48c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/bba88824-45fe-4343-9493-4aec3fb1467d.png?resizew=148)
(1)求直线PA与平面DEF所成角的正弦值;
(2)求点P到平面DEF的距离;
(3)求点P到直线EF的距离.
您最近一年使用:0次
2023-08-03更新
|
1560次组卷
|
6卷引用:福建省漳州市东山第二中学2021-2022学年高二下学期期中考试数学(A)试题
福建省漳州市东山第二中学2021-2022学年高二下学期期中考试数学(A)试题(已下线)高二上学期期中复习【第一章 空间向量与立体几何】十大题型归纳(拔尖篇)-2023-2024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)第6章 空间向量与立体几何 综合测试广东省云浮市罗定中学城东学校2023-2024学年高二上学期10月月考数学试题(已下线)模块四 专题4 大题分类练 《空间向量与立体几何》拔高能力练(已下线)专题07 空间中的距离5种常见考法归类 - 【考点通关】2023-2024学年高二数学高频考点与解题策略(人教B版2019选择性必修第一册)
名校
2 . 已知非零向量
,
满足
,且
,则向量
与
的夹角为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82a102684873f9dfde748535cdc6b0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fab3f98be01a622d8305cb05766929f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
您最近一年使用:0次
2023-08-02更新
|
823次组卷
|
8卷引用:新疆乌鲁木齐市第七十中学2023届高三上学期期中数学(理)试题
3 . 下列不等式不一定成立的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
解题方法
4 . 已知函数
及其导函数
的定义域均为
,记
,若
,
,且
不恒为零,则下列结论中,一定正确的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585de67a3fc494297d375d339af6d153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c400633e80c2f8979e0883b6f649e59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48dc6d0827a159050e3fa55164f258b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
5 . 在平面直角坐标系
中,椭圆
的左、右焦点分别为
,
,已知点
在直线
上运动,且
,当
时,
在
上.
(1)求
的方程;
(2)设
在
外,过点
的直线
与
交于
,
两点,且直线
,
与直线
分别交于点
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db44549e849cb65873bc28c032b4f89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f790ee452e9a8b1d6a7d4650e4f89365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7291b3d921f595f28960abcdce6dfbed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](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/945b573931610026200d4c7fc0c1249c.png)
您最近一年使用:0次
名校
6 .
年卡塔尔世界杯即将于
月
日开幕.某球迷协会欲了解会员是否前往现场观看比赛,按性别进行分层随机抽样,已知男女会员人数之比为
,统计得到如下列联表:
(1)求
,
的值,依据小概率值
的独立性检验,能否认为是否前往现场观看比赛与性别有关?
(2)用频率估计概率,假设会员是否前往现场观看互不影响,若从拟前往现场观看的会员中随机抽取
人进行访谈,求在访谈者中,女性不少于
人的概率.
附:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d01dd350dc95f42f1883e0cc7aae084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b1dcdac71e394e495d069f64e1f1ce9.png)
前往现场观看 | 不前往现场观看 | 合计 | |
女性 | ![]() | ![]() | |
男性 | ![]() | ![]() | |
合计 | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f3c8e57e3b2377fa388ce1b7630f5b.png)
(2)用频率估计概率,假设会员是否前往现场观看互不影响,若从拟前往现场观看的会员中随机抽取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dc70b5e1ba847b9918a50f67bfbe8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c05f602bf2d72734920953dabd9a4.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
您最近一年使用:0次
2023-12-21更新
|
1299次组卷
|
3卷引用:福建省漳州市东山第二中学2023届高三上学期期中数学试题
7 . 设
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be6301f91844096406081f5284ff99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d6ef92a4009d884fc2f76ab27da90c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874c582df923bebd0650eb087f39b745.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
8 . 已知平面向量
均为单位向量,若
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12e95f703ad30ab9a3d38376830989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6098d74fbdf03a92ee2bd4b25ccf11b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591b482c527876b20d17464e0cbff4f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48f62840b5922c52bd47503d3e0bd65.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
9 . 定义在R上的函数
的导函数为
,若
,
,则不等式
的解集为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1dc50507511f09273703638a2d40e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f3c8359824763bdd9e35033cff6fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17002701d5941e03acbd06e01d05257a.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
解题方法
10 . 针对时下的“抖音热”,校团委对“学生性别和喜欢抖音是否有关”作了调查,其中被调查的男女生人数相同,男生喜欢抖音的人数占男生人数的
,女生喜欢抖音的人数占女生人数
,若有90%的把握认为是否喜欢抖音和性别有关,则调查人数中男生可能有( )人
附表:
附:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
附表:
![]() | 0.100 | 0.050 | 0.010 | 0.005 | 0.001 |
k | 2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
A.20 | B.30 | C.35 | D.40 |
您最近一年使用:0次
2023-12-21更新
|
510次组卷
|
3卷引用:福建省漳州市东山第二中学2021-2022学年高二下学期期中考试数学(A)试题