1 . 如图,已知椭圆
的方程为
,点
、
分别是椭圆
的左、右顶点,点
的坐标是
,过点
的动直线
交椭圆
于点
、
(点
的横坐标小于点
的横坐标).
焦点的坐标;
(2)是否存在常数
,使
为定值,若存在,求出
的值;若不存在,请说明理由.
(3)当设直线
的斜率不为
时,设直线
与
交于点
.请提出一个与点
有关的问题,并求解该问题.
(备注:本小题将根据提出问题的质量及其解答情况进行分层计分.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82e7d9f4f7ace849e09e9adcb786b7f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfa2a6d9749a619edf80bad8b3e4962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)是否存在常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45336b55d682027bdd4c2ce103287c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(3)当设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(备注:本小题将根据提出问题的质量及其解答情况进行分层计分.)
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解题方法
2 . 已知双曲线C的标准方程为
.若虚轴长为
,且双曲线上的任意一点P到左右两个焦点
距离之差的绝对值为2.
(1)求双曲线C的标准方程;
(2)若点
(0,1),求
的取值范围;
(3)若斜率为
的直线
过右焦点
,且与C的右支相交于A、B两点,问:在x轴上是否存在定点M,使得无论直线
绕点
怎样转动,总有
成立?如果存在,求出定点M的坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ec7fa23be9cbe9a50607ea6bc8a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923cc0c9abcb27048b62c1164471b261.png)
(1)求双曲线C的标准方程;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44e8bc37ed03f44470762748a8f942a.png)
(3)若斜率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d79ef94d43b2afa595c580906358b1.png)
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名校
3 . 时下流行的直播带货与主播的学历层次有某些相关性,某调查小组就两者的关系进行调查,从网红的直播中得到容量为200的样本,将所得直播带货和主播的学历层次的样本观测数据整理如下:
(1)依据小概率值
的独立性检验,分析直播带货的评级与主播学历层次是否有关?
(2)现从主播学历层次为本科及以上的样本中,按比例分配分层随机抽样的方法选出5人组成一个小组,从抽取的5人中再抽取2人参加主播培训,求这2人中,主播带货优秀的人数
的概率分布和数学期望;
(3)统计学中常用
表示在事件A条件下事件B发生的优势,称为似然比,当
时,我们认为事件A条件下B发生有优势.现从这200人中任选1人,A表示“选到的主播带货良好”,B表示“选到的主播学历层次为专科及以下”,请利用样本数据,估计
的值,并判断事件A条件下B发生是否有优势.
附:
,
.
主播的学历层次 | 直播带货评级 | 合计 | |
优秀 | 良好 | ||
本科及以上 | 60 | 40 | 100 |
专科及以下 | 35 | 65 | 100 |
合计 | 95 | 105 | 200 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
(2)现从主播学历层次为本科及以上的样本中,按比例分配分层随机抽样的方法选出5人组成一个小组,从抽取的5人中再抽取2人参加主播培训,求这2人中,主播带货优秀的人数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(3)统计学中常用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5091a10c26339e9a4fb4b14a5c45d71c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61143b1d0678120fe4374067d2f8c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30b8fd3bedae8c547a59e21e3c8c8d4.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dc70b5e1ba847b9918a50f67bfbe8f.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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4 . 已知复数
,且
,
(1)求
的实部与虚部;
(2)若
是关于
的方程
,且
的一个复数根,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21094e3ba9668654a9d3afea8de90548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f253ceacadcf3ee5640fb844eddaac.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a120c3b2b8c82da2b4fb15fafee77bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1357f8541d064df1b9a7af0bf950c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
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5 . 甲、乙、丙三人相互做传球训练,第1次由甲将球传出,每次传球时,传球者都等可能地将球传给另外两人中的任何一人.设n次传球后球在乙手中的概率为
;
(1)求
;
(2)求
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7807638578edd712265463a7a5eab0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
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6 . 已知函数
.
(1)求函数
的最小正周期;
(2)若
,求函数
的值域.
(3)若函数
在
上有且仅有两个零点,则求
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef39930eacbed146434956b255ed001.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/583d608b16b9955af9a715dd3a88f9c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9998f27aca8e31ba479b96858b509c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75c1f550812b2ca820e00e6e5810d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
7 . 如图,这是某种型号的奖杯,它是用一个正四棱台、一个正四棱柱和一个球焊接而成的球的半径为
.正四棱柱的底面边长为
,高为
.正四棱台的上、下底面边长分别为
和
,斜高(即侧面梯形的高)为
.
表示,焊接处对面积的影响忽略不计);
(2)已知
,若为奖杯表面镀金所用的材料每
可以涂
,且该种型号的奖杯底面(图中正四棱台的下底面作为该种型号的奖杯的底面,一般底面采用其他村质)不需要镀金,则为100个这种型号的奖杯镀金约需要多少材料?(
取3.14,精确到
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7f30167e1135806fe9de641870b1e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8531b57064ada226c3f3ca2c8cc6383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753d029529e96c18464e5649cc2019dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7083b5636c7b87bf31a95eb750668267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da165d3d3de8812ab633e6276ed907b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a413309ee88e7184c2e99b39feaa266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090c07aece85100f0733e9f0c9eb13b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37d3860a1a4144a424a27fd121742f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d22e6589811741967bbf91724ae49a.png)
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8 . 求下列函数的导数.
(1)①
;②
;③
;
(2)①
;②
;
(3)①
;②
;③
.
(1)①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884e534313d810d5fc36b95f9fcaa08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e769299acbcc266a35ddd6848452f14.png)
(2)①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11b587eab7ca8cd4ec6d3dd1c8b4585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10408555b8279a4e9621d077acf7a97.png)
(3)①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/125bea9ef0d4a26ac65cacf66536b388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1454530ed83e70e2831ec0fd8d9d48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e841547b8732a15323ab74fb109f360.png)
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9 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a18084f69518fdddd1242cf8b84a51.png)
(1)若b=0,求函数
在x=1处的切线方程;
(2)若b=2,求函数
的极值;
(3)讨论函数
的单调性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a18084f69518fdddd1242cf8b84a51.png)
(1)若b=0,求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)若b=2,求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(3)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
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解题方法
10 . 在
中,角
的对边分别为
.已知
,且
.
(1)求
;
(2)若
为边
的中点,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4361dd161a1a76fc21d64405686f7a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb432a741c08243d6c2aa3f72fa18b03.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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