1 . 电信诈骗是指通过电话、网络和短信方式,编造虚假信息,设置骗局,对受害人实施远程诈骗的犯罪行为.随着
时代的全面来临,借助手机、网银等实施的非接触式电信诈骗迅速发展蔓延,不法分子甚至将“魔爪”伸向了学生.为了调查同学们对“反诈”知识的了解情况,某校进行了一次抽样调查.若被调查的男女生人数均为
,统计得到以下列联表.经过计算,依据小概率值
的独立性检验,认为该校学生对“反诈”知识的了解与性别有关,但依据小概率值
的独立性检验,认为该校学生对“反诈”知识的了解与性别无关.
(1)求
的值;
(2)将频率视为概率,用样本估计总体,从全校男生中随机抽取5人,记其中对“反诈”知识了解的人数为
,求
的分布列及数学期望.
附:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d29fd30d6b35bc557228b65e12a74d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a8b01df10e9945cde9d470d5372a6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793afd75d2b29a7bd118aae3294293c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
性别 | 不了解 | 了解 | 合计 |
女生 | ![]() | ||
男生 | ![]() | ||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)将频率视为概率,用样本估计总体,从全校男生中随机抽取5人,记其中对“反诈”知识了解的人数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dc70b5e1ba847b9918a50f67bfbe8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.10 | 0.05 | 0.025 | 0.01 | 0.001 |
![]() | 2.706 | 3.841 | 5.024 | 6.635 | 10.828 |
您最近一年使用:0次
解题方法
2 . 若a,b均为正实数,且满足
.
(1)求
的最大值;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89dc8118d95d6c7bd5b7d38667a498e8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbcb79c362bddb898f8a9d02a5f5d085.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd9ff4f42b949e370af7b5be296a7ab.png)
您最近一年使用:0次
7日内更新
|
322次组卷
|
3卷引用:四川省眉山市仁寿县仁寿第一中学校(北校区)2024届高三模拟预测理数试题
名校
解题方法
3 . 正项数列
的前
项和为
,等比数列
的前
项和为
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91dfd65e02c363292a2e560a438a7113.png)
(1)求数列
的通项公式;
(2)已知数列
满足
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab475015a71ab9849ecb02936da02dc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91dfd65e02c363292a2e560a438a7113.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adbb1af734df519ad850f4aa570a14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87bd7d18f67e90a7c37fad4252e43c9d.png)
您最近一年使用:0次
7日内更新
|
945次组卷
|
3卷引用:四川省眉山市仁寿县仁寿第一中学校(北校区)2024届高三模拟预测理数试题
解题方法
4 . 在平行四边形
中,
,
,
,沿
将
折起,则三棱锥
的体积最大时,三棱锥
外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdaf0d5ffc528a3cd85c79e3317c440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
7日内更新
|
563次组卷
|
3卷引用:四川省眉山市仁寿县仁寿第一中学校(北校区)2024届高三模拟预测理数试题
5 . 已知等差数列
的公差为
,前
项和为
,且
,
则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b0f60ed9597e67a7a4c9e9af826c2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e425bc1cd8f3550638b4040326960b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
A.1 | B.![]() | C.![]() | D.-1 |
您最近一年使用:0次
7日内更新
|
590次组卷
|
3卷引用:四川省眉山市仁寿县仁寿第一中学校(北校区)2024届高三模拟预测理数试题
名校
解题方法
6 . 已知向量
满足
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cb6bb582bb4d231c2b24febe19c6f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/144e58c38f69677769e88ce3a7dceb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01499a2db010085fba3e561c16284395.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-06-05更新
|
842次组卷
|
4卷引用:四川省眉山市2024届高三下学期第三次诊断考试理科数学试题
名校
解题方法
7 . 已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75bb46922f97147594f646f373c10703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5acb85cce3c0e8690fb31a0fd8b53a5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-06-03更新
|
877次组卷
|
3卷引用:四川省眉山市2024届高三下学期第三次诊断考试理科数学试题
8 . 如图,在多面体
中,四边形
为菱形,平面
平面
,平面
平面
是等腰直角三角形,且
.
平面
;
(2)若
,求平面
与平面
所成锐二面角的余弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0e7e1ea69f9f455e8496304b6a30c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bde1e200d1dd5ddc433c876c9d2f688c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db74cdd38ce73c5631cad19c1f39804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76474dae014dc19bcbe7c1919a6d3044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d98d25467d8a11ddeeb1e6e18eb704f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fffcd1e524b0c7ef79f84384817293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
您最近一年使用:0次
2024-06-03更新
|
681次组卷
|
4卷引用:四川省眉山市2024届高三下学期第三次诊断考试理科数学试题
四川省眉山市2024届高三下学期第三次诊断考试理科数学试题四川省雅安市神州天立学校2024届高三高考适应性考试(三)数学(理)试题(已下线)第4套 新高考全真模拟卷(三模重组)(已下线)易错点4 忽视法向量夹角与二面角的关系
解题方法
9 . 如图,该组合体由一个正四棱柱
和一个正四棱锥
组合而成,已知
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724625d4f91f0e48712d6d143a6389b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77f6f633fa03009e44a9f0f59a8b628.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
解题方法
10 . 某公司为改进生产,现对近5年来生产经营情况进行分析.收集了近5年的利润
(单位:亿元)与年份代码
共5组数据(其中年份代码
分别指2019年,2020年,
年),并得到如下值:
.
(1)若用线性回归模型拟合变量
与
的相关关系,计算该样本相关系数
,并判断变量
与
的相关程度(
精确到0.01);
(2)求变量
关于
的线性回归方程,并求2024年利润
的预报值.
附:①
;②若
,相关程度很强;
,相关程度一般;
,相关程度较弱;③一组数据
,其回归直线
的斜率和截距的最小二乘估计分别为
;相关系数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5b7e291f8e7de3107b2347d70fcba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4a42a05b9f28ae394e281ee2b2647c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e97ce66fa011ea391d286ef2a8681c.png)
(1)若用线性回归模型拟合变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(2)求变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
附:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5fa7e6128518293c33deb954937e72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2991502b0be7df4183b9e42b6c53c6e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17366d0d11336e19e102713aeb797e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9377dbdab50ee9ea58514f3e274bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eafbe64ec9acf78f3624abbd06d516e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76c7294338149b6a7b92f11e9e87bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ecff49cff3fdb63aa13f8505d7c55bc.png)
您最近一年使用:0次