解题方法
1 . 2024年4月6号岳阳马拉松暨全国半程马拉松锦标赛(第三站)开赛,比赛结束后,其中5男3女共8位运动员相约在赛道旁站成前后两排合影,每排各4人,若男运动员中恰有2人左右相邻,则不同的排列方法共有( )
A.732种 | B.2260种 | C.4320种 | D.8640种 |
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解题方法
2 . 已知抛物线
:
,直线
与抛物线
交于
,
两点,
为坐标原点.
(1)若直线
过
的焦点
.
(
,
)与
交于四点
,
,
,
,记弦
,
的中点分别为
,
,求证:线段
被定点平分,并求定点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(i)当的面积最小时,求直线
的方程;
(ii)当,记
的外接圆
与
的另一个交点为
,求
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a01cad957bd5a9e4f0c931cf5510a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dd0914dc4d4c7f75710ff460a286fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ba6b6aa6c3f9faba6b03bc193a6e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.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/411461db15ee8086332c531e086c40c7.png)
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3 . 如图,A,B是抛物线
上两点,满足
(O是坐标原点),过点O作直线
的垂线,垂足为D,记D的轨迹为M.
(2)设
是M上一点,从P出发的平行于x轴的光线被抛物线C反射,证明:反射光线必过抛物线C的焦点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4250c5c69f4f92bd675cf4fa11fc97a.png)
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名校
4 . 椭球面镜具有改变光路的方向、使光束会聚的作用,它经常被用来制作精密的光学仪器的部件.椭球面镜是以椭圆的长轴为旋转轴,把椭圆转动
形成的立体图形,其内表面全部做成反射面,中空,椭球面镜可以将从某个焦点发出的光线全部反射到另一个焦点处.从椭球面镜的焦点
射出的两条光线,经椭球面镜上的
两点反射后汇聚于焦点
,若
,且
,则椭球面镜的轴截面椭圆的离心率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e7a123c9cc0e058db28841fb0edcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea693124f0e69270669bf34a2c4ad9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9766e5e316ac8e8ecae1779070799a4.png)
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解题方法
5 . 某市开展“安全随我行”活动,交警部门在某个交通路口增设电子抓拍眼,并记录了某月该路口连续10日骑电动摩托车未佩戴头盔的人数
与天数
的情况,对统计得到的样本数据
作了初步处理,得到下面的散点图及一些统计量的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/19/0aaac424-3688-4c46-9668-42819e4498f9.png?resizew=165)
表中
,
.
(1)依据散点图推断,
与
哪一个更适合作为未佩戴头盔人数
与天数
的回归方程类型?(给出判断即可,不必说明理由)
(2)依据(1)的结果和上表中的数据求出
关于
的回归方程.
(3)为了解佩戴头盔情况与性别的关联性,交警对该路口骑电动摩托车市民进行调查,得到如下列联表:
依据
的独立性检验,能否认为市民骑电动摩托车佩戴头盔与性别有关联?
参考公式:
,
,
,其中
.
![](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/46b4829b8c04f68d08b4272f1e5b7d0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/19/0aaac424-3688-4c46-9668-42819e4498f9.png?resizew=165)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
5.5 | 8.7 | 1.9 | 301 | 385 | 79.75 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7179f49001d08c5011a1dcbfdc7930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4beaf3d206d85e2e6c8d25ab79b62e1c.png)
(1)依据散点图推断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b447ac3d1a965572c31b6e4c18d4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a9622a53d958999eecaefc85597b52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)依据(1)的结果和上表中的数据求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)为了解佩戴头盔情况与性别的关联性,交警对该路口骑电动摩托车市民进行调查,得到如下列联表:
性别 | 佩戴头盔 | 合计 | |
不佩戴 | 佩戴 | ||
女性 | 8 | 12 | 20 |
男性 | 14 | 6 | 20 |
合计 | 22 | 18 | 40 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f81f285940b14b97f368469121efab.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c226c805bf76bc0ad35c45806feb73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b38cfee12dbeeab57c707dca8643538a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
![]() | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
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6 . 下列说法中错误的是( )
A.独立性检验的本质是比较观测值与期望值之间的差异 |
B.两个变量x,y的相关系数为r,若![]() |
C.若一组样本数据![]() ![]() ![]() |
D.由一组样本数据![]() ![]() ![]() ![]() ![]() |
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解题方法
7 . 已知
为实数集
的非空子集,若存在函数
且满足如下条件:①
定义域为
时,值域为
;②对任意
,
,均有
. 则称
是集合
到集合
的一个“完美对应”.
(1)用初等函数构造区间
到区间
的一个完美对应
;
(2)求证:整数集
到有理数集
之间不存在完美对应;
(3)若
,
,且
是某区间
到区间
的一个完美对应,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933093b52cca887f597cbe22a5467b11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c42648f413abc4ec6b042f0924e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e7ee80da08376cb9a6f0ac641b2d1f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)用初等函数构造区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f14df2d8d1fea71da4197e81b6ee3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d65bdc820ab87b9a7909d2be591abec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
(2)求证:整数集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/067802ecb7978511f798ef27d02e890b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ecb1589c3cc179e2f62507020771e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e8835e96965b13d49dd1481403eb997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aff8d9b6533ff319420cdc5e8740b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e2bb6cfd4b2fa49622dc9b7c39b62b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解题方法
8 . 设一个简单几何体的表面积为
,体积为
,定义系数
,已知球体对应的系数为
,定义
为一个几何体的“球形比例系数”.
(1)计算正方体和正四面体的“球形比例系数”;
(2)求圆柱体的“球形比例系数”范围;
(3)是否存在“球形比例系数”为0.75的简单几何体?若存在,请描述该几何体的基本特征;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e32d2d3759b3edd79ef82c1f61d3f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb75fdaefb95f5061a0b33c2559f446b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d66edadaad08a904172a9c162529b57.png)
(1)计算正方体和正四面体的“球形比例系数”;
(2)求圆柱体的“球形比例系数”范围;
(3)是否存在“球形比例系数”为0.75的简单几何体?若存在,请描述该几何体的基本特征;若不存在,说明理由.
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解题方法
9 . 已知正方体
和点
,有两个命题:
命题甲:存在
条过点
的直线
,满足
与正方体的每条棱所成角都相等;
命题乙:存在
个过点
的平面
,满足
与正方体的每个面所成锐二面角都相等;
则下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
命题甲:存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
命题乙:存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
则下列判断正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
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10 . 设
为大于2的自然数,将二项式
两边同时求导,可以得到一些特别的组合恒等式
,结合课本中杨辉三角研究方法,可以得到![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f15fc276a46463377bcecb7c6e174b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb174c123cb7dd2d47237adc5b17acae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5ee37c0c6e04fe8d2647b7563243e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f15fc276a46463377bcecb7c6e174b.png)
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