1 . 某校数学兴趣小组有14位同学,他们组成了n个不同的课题组.每个课题组有6位同学,每位同学至少参加2个课题组,且任意两个课题组至多有2位共同的同学,求n的最大值.
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2 . 已知函数
.
(1)若
恒成立,求a的最小值;
(2)若
存在最大值,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/083ad02d1a6ec52d79cee9321938a762.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fce85097fee1cbceeace9d1873fa71a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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3 . 如图,
、
分别是△ABC、△ACD的重心,
的外接圆与直线BD相交于点P,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc71c35d851ff74646c728756b24efb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/951d73cefe3fed1c5e70210ce71ae2fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5035afd29380c8912a02ac79a7db19b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a69a73f2044f45086374c2e068b548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3269cf61861183004455d640aac8ccf0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/ada6f890-0c6f-474f-a6a8-d92f18e4566a.jpg?resizew=193)
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4 . 已知椭圆C:
的离心率为
,
、
分别为椭圆C的左、右顶点,
、
分别为椭圆C的左、右焦点,B为椭圆C的上顶点,且
的外接圆半径为
.
(1)求椭圆C的方程;
(2)设与x不垂直的直线l交椭圆C于P、Q两点(P、Q在x轴的两侧),记直线
、
、
、
的斜率分别为
、
、
、
.已知
,求
面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad7451b947d1adea22bc04070efdd2b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9721059d158853671eaf19e39769b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8db4b168ddbcba90ac9b31d36a0432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82fe25db889399bb3ca4ffd5dd5db84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61d572ecf27dc02fcbd588f24647b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/130c1bb7866e816804248f5eb8c59417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68316a6c48b33c53e2725274c8e1d65.png)
(1)求椭圆C的方程;
(2)设与x不垂直的直线l交椭圆C于P、Q两点(P、Q在x轴的两侧),记直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1d228a6558961e7346d0326207dacf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69286a11bc6a2641c73542167ce2c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cfdaad60640c4c023a339ffdc459d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95dfc574d8ed4f6e828a9c5c40788d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2562424a83aae7e4b3f8adf90307961a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b58edb637c5dfa03794f3952de9d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be76756ea33cd487013256cbe942a3cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9fa1f26b7d3a7a600ad370cfa176f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7ee33f0fa8b278c793a691206b1fb83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05470dc94e4d9eea98d2c533ce576b07.png)
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5 . 如果对任意的整数x,y,不等式
恒成立,求最大常数k.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c0252c0000385c3f7bfb989f266c87.png)
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6 . 已知
,
,…,
是集合
的n个非空子集,如果对于任意的i,
,均有
,则n的最大值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9721059d158853671eaf19e39769b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8db4b168ddbcba90ac9b31d36a0432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e11e77f3276edde5c0a9f2057beb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a42daf2970136f21f3e5b3b2f96fe44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac30abcc83eecff9e2cb8dabc1d10ac8.png)
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7 .
的末三位数是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce59b1cb2c7c9978fbf1450dcca76e95.png)
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8 . 已知
,
,
,且
,则
的最大值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4aa0e79f03404207ee3da7262922f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32c9bb7fe249c8054979b97fe032eb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5122f4a3ce9717386f47796b1193adde.png)
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9 . 已知双曲线C:
的离心率为
,
、
分别为C的左、右焦点,过
的直线l交C于A、B两点(点A在第一象限),且
若
的面积为
,则
内切圆半径为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3040b6c904477030ecf8ba20b2b18759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f8f7e40ba386c0a9675896b52752d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82fe25db889399bb3ca4ffd5dd5db84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61d572ecf27dc02fcbd588f24647b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61d572ecf27dc02fcbd588f24647b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35c18ad167885ce5fd21176665d6a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7351556b6a4cf148007c3db422023d08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031661aa4b14c3b9954ec444ad5b6f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ff8a5886e42095da57422c8777c10d.png)
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10 . 从1,2,3,…,11这11个正整数中任意抽取3个不同的正整数a,b,c,则它们的积abc能被4整除的概率为___________ .
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