名校
解题方法
1 . 设集合
(
),
为
的非空子集,随机变量
,
分别表示取到子集
中得最大元素和最小元素的数值.
(1)若
的概率为
,求
;
(2)若
,求
且
的概率;
(3)已知:对于随机变量
,
,有
.求随机变量
的均值
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9dfe86bf99f7bd82b3ea703febf26ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c4b25a0b76fba785d5769c08714b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ab109ec88d6f3d24b2f01ca77e7038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe08722cf9300fe188dbbb71989c06c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32a2f594955e456f0fddad1e090bb04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b3576b4d98a5b4ddc380ddaa0fa281.png)
(3)已知:对于随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096b1ece1dcd29c59a46a4b3e02cb548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5031a3a951c4a1d1c5e9f80a5e26513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bed5c625495d0ae6d4c3c476aa73c80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9f6ea6346066054b5c722763d6b026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e2517ab0c7decdfd0f90c79dc3cb16.png)
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解题方法
2 . 在探究
的展开式的二项式系数性质时,我们把系数列成一张表,借助它发现了一些规律.在我国南宋数学家杨辉1261年所著的《详解九章算法》一书中,出现了这个表,我们称这个表为杨辉三角.杨辉三角是中国古代数学中十分精彩的篇章.杨辉三角如下图所示:
第0行 1
第1行 1 1
第2行 1 2 1
第3行 1 3 3 1
第4行 1 4 6 4 1
第5行 1 5 10 10 5 1
第6行 1 6 15 20 15 6 1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
如上图,杨辉三角第6行的7个数依次为
,
,
…
,
.现将杨辉三角中第
行的第
个数乘以
,第0行的一个数为0,得到一个新的三角数阵如下图:
第0行 0
第1行 0 1
第2行 0 2 2
第3行 0 3 6 3
第4行 0 4 12 12 4
第5行 0 5 20 30 20 5
第6行 0 6 30 60 60 30 6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
在这个新的三角数阵中,第10行的第3个数为________ ;从第一行开始的前
行的所有数的和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9216a0f9d6e65ea4937ab7bf102c5db.png)
第0行 1
第1行 1 1
第2行 1 2 1
第3行 1 3 3 1
第4行 1 4 6 4 1
第5行 1 5 10 10 5 1
第6行 1 6 15 20 15 6 1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
如上图,杨辉三角第6行的7个数依次为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c157f0f16f099230f1831cff5a3aae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14ad7c0d051c4a14c35ba35bd8e6675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88120a74c84c257915b5c060e503008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93dc96c400e9f6aa2f55f646c427e02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59cfd02b309dbdda35440c860bac311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8a7c6d10fc680085289ed89f2b4878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35994cf95c433ff61cdcc6345acc53f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db68583bc5ded5e0cf7028c0fd4297ab.png)
第0行 0
第1行 0 1
第2行 0 2 2
第3行 0 3 6 3
第4行 0 4 12 12 4
第5行 0 5 20 30 20 5
第6行 0 6 30 60 60 30 6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
在这个新的三角数阵中,第10行的第3个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b568d18fba797efb24d3baf3be98768b.png)
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解题方法
3 . 对于
,
,
不是10的整数倍,且
,则称
为
级十全十美数.已知数列
满足:
,
,
.
(1)若
为等比数列,求
;
(2)求在
,
,
,…,
中,3级十全十美数的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b1cfbfdf8e1b22aab9583e12e3449c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f0e26992724eafcba06d163d9ff470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4217b1854fee34983372bf4f3a877d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdf53108bee755f5aa9a34ea4d163e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c2b5e218eb815213d8bc0ce9a06ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac416116febcf793fee4ccc78a27b15.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0f62daf8552adeb241c9b54a57cd83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)求在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11075f2c574b6c59b97fb3038000e38.png)
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2024-05-14更新
|
784次组卷
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6卷引用:重庆市第一中学校2023-2024学年高二下学期5月月考数学试题
名校
解题方法
4 . 某学校即将参加一场重要的篮球比赛,通过比赛获得荣誉,不仅能为学校争光,也能为自己的高中生活增添一抹亮丽的色彩.现要从
名学生中选出
名组成代表队,其中
名作为主力队员,
名作为替补队员.设选出代表队的不同方法种数为
.
(1)求出的
的值(用组合数表示);
(2)已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9713d7ffbb58aa922922e6fb9562049f.png)
.当
,
时,记选出代表队的不同方法种数为
,求
;
(3)当
为偶数时,求
被4除的余数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598e17251bb912de24d31572b7f01686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4827f538b9721a48ca89c992f172264.png)
(1)求出的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4827f538b9721a48ca89c992f172264.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9713d7ffbb58aa922922e6fb9562049f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950af9e919897251e32993d008ea5e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a61d972030f7a3703e8e4816e08de16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d13b6d14fe3ecca708c992955b5a3c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e45c64ab23c70311c764021e8d1923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198d06e1e36f9fc593b636d3df6f7058.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198d06e1e36f9fc593b636d3df6f7058.png)
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2024-05-11更新
|
236次组卷
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2卷引用:重庆市西北狼教育联盟2023-2024学年高二下学期4月期中联合测试数学试卷
名校
解题方法
5 . 使用二项式定理,可以解决很多数学问题.已知
可以写成:
,将它展开式的第
项令为
,
,
,则
取最大值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553384bfa2150b822af3dd6ce24dcc3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb53c9ae7fa6fe18ddaad7d98a34970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b00f4eb7f1bd2ccefbabf0c1dfa8f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5495b856f0dac249f345faec653ad7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e10f2f74e201f77f853e9ed9078615c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714d53a67bfe7004b46eb3f84940b4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7a84d7e5d6236009a8be655bd500fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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6 . 组合数有许多丰富有趣的性质,例如,二项式系数的和有下述性质:
.小明同学想进一步探究组合数平方和的性质,请帮他完成下面的探究.
(1)计算:
,并与
比较,你有什么发现?写出一般性结论并证明;
(2)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cf05cc396bfd61e5b454a2c1968db9.png)
(3)利用上述(1)(2)两小问的结论,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be8e65b445c4e869abf3b238d907be0.png)
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307025d26774c6009ac7ca68816dd2ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba18fe04a78ca85e9e127a0f6de11d5e.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cf05cc396bfd61e5b454a2c1968db9.png)
(3)利用上述(1)(2)两小问的结论,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6082d3f4e04a95e3c2337228630b3c43.png)
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2024-04-12更新
|
739次组卷
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3卷引用:重庆市乌江新高考协作体2023-2024学年高二下学期5月期中考试数学试题
7 . 莫比乌斯函数在数论中有着广泛的应用.所有大于1的正整数
都可以被唯一表示为有限个质数的乘积形式:
(
为
的质因数个数,
为质数,
),例如:
,对应
.现对任意
,定义莫比乌斯函数
(1)求
;
(2)若正整数
互质,证明:
;
(3)若
且
,记
的所有真因数(除了1和
以外的因数)依次为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e046acc0e785892df1ef03a440b0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5c607987b73502db63f77c9799f4bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fe943e1acfb453f41bee79119cce60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38261aad19184a74c797b6b88ffd344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86cb09df4dbbe40a2b7ed54da17346dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09881de0dc186bbcd1e60eb00159ee97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b5872b44498c348c023828ed66e86d1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b2c4263428e2ee419589171f27e23f.png)
(2)若正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/201e0fbcfb6833c4b1917cfed3096b6f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e468312d09c6563c9094b710a35a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4a887eaea7f0aac8505ed3b3c0c678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4811e3603e8790c25aaf91c41d7c7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/202a57af91d5be04e95fcbdb8f2b788f.png)
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2024-03-26更新
|
1274次组卷
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5卷引用:重庆市乌江新高考协作体2023-2024学年高二下学期第一阶段学业质量联合调研抽测(4月)数学试题
重庆市乌江新高考协作体2023-2024学年高二下学期第一阶段学业质量联合调研抽测(4月)数学试题湖南省衡阳市2024届高三第二次联考数学试题河南省南阳市西峡县第一高级中学2023-2024学年高二下学期第一次月考数学试卷(已下线)压轴题08计数原理、二项式定理、概率统计压轴题6题型汇总(已下线)【人教A版(2019)】高二下学期期末模拟测试A卷
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8 . (1)计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5b65bf8fe4a67b46b44325bc598141.png)
的值,并求
除以8的余数
;
(2)以(1)为条件,若等差数列
的首项为
,公差
是
的常数项,求数列
前
项和的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5b65bf8fe4a67b46b44325bc598141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be613fff0421d9be9e8bb5eb8b07c40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000cd6f8ab4acbcf553663b8dc1fa323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)以(1)为条件,若等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91b6feb2dce77cbfe91f62449c23f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2023-05-21更新
|
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6卷引用:重庆市万州第二高级中学2023-2024学年高二下学期期中质量监测数学试题
重庆市万州第二高级中学2023-2024学年高二下学期期中质量监测数学试题湖北省重点高中智学联盟2022-2023学年高二下学期5月联考数学试题(已下线)模块二专题3 《计数原理》单元检测篇 B提升卷(人教A)(已下线)模块二 专题1 《计数原理》单元检测篇 B提升卷(北师大2019版)(已下线)模块二 专题1 《计数原理》单元检测篇 B提升卷(人教B )(已下线)模块二 专题2 《计数原理》单元检测篇 B提升卷(苏教版)
名校
9 . 下列说法中,其中正确的是( )
A.命题:“![]() ![]() |
B.化简![]() |
C.![]() ![]() |
D.在三棱锥![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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