名校
1 . 泊松分布是一种重要的离散型分布,用于描述稀有事件的发生情况.如果随机变量
的所有可能取值为0,1,2…,且
,
其中
,则称
服从泊松分布,记作
.
(1)设
,且
,求
;
(2)已知当
,
时,可以用泊松分布
近似二项分布
,即对于
,
,当
不太大时,有
.
(ⅰ)已知甲地区共有100000户居民,每户居民每天有0.00010的概率需要一名水电工.试估计某天需要至少2名水电工的概率;
(ⅱ)在(ⅰ)的基础上,已知乙地区共有200000户居民,每户居民每天有0.00004的概率需要一名水电工.试估计某天两个地区一起至少需要3名水电工的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d9506436f1f7db2b7c20a84f9a5f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4988011c1e60a6256c25c3bdff4bd352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a0f8d6451376d85c0f432c74faf33.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a0f8d6451376d85c0f432c74faf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a80cdc7e5d4067d00dff0a0b347b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e39326381d0fbd83c8156c3b33e74eb.png)
(2)已知当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c4fe5a95acf4db3241c6cba652e1589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9529cc68a2f219ea5e6f467af4b6e8d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9edd73921106b5c092f6b685ada1f5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3821cada1948964a9741005833f52d01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989602dd198d2cb52fc1875921d56ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761ddcffd715d75da2c739fe67fa3a96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6c010e17368e545d63217810ffc8fb.png)
(ⅰ)已知甲地区共有100000户居民,每户居民每天有0.00010的概率需要一名水电工.试估计某天需要至少2名水电工的概率;
(ⅱ)在(ⅰ)的基础上,已知乙地区共有200000户居民,每户居民每天有0.00004的概率需要一名水电工.试估计某天两个地区一起至少需要3名水电工的概率.
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2 . 某高中高二(1)班10名学生、高二(2)班10名学生、高二(3)班20名学生参加“少年强则国强”演讲比赛,比赛采用随机抽签的方式确定出场顺序,每位学生依次出场.记“高二(1)班全部学生完成比赛后,高二(2)班和高二(3)班都有学生尚未完成比赛”为事件A,则事件A发生的概率为_______________ .
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解题方法
3 . 设数列
的前
项和为
,且满足
.
(1)求数列
的通项公式;
(2)解关于
的不等式:
;
(3)若
,求证:数列
前
项和小于
.
![](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/8e7914fdb68e1fbebc44e675e041e5a7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)解关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082beb2f300cd6d28d2fbbc0709ec26f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135a6e44401b3e7b21fa1ad1442997fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478232c9a6b2db6020612a13afb350a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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解题方法
4 . 现有A,B两个不透明盒子,都装有m个红球和m个白球,这些球的大小、形状、质地完全相同.
(1)若
,甲、乙、丙依次从A盒中不放回的摸出一球,设X表示三人摸出的白球个数之和,求X的分布列与数学期望;
(2)若
,从A、B两个盒子中各任取一个球交换放入另一个盒子中,
次这样的操作后,记A盒子中红球的个数为
,求:
(i)
的概率;
(ii)
的分布列.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3cc8c48bf54ec8252e5dce6867754.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65981f597cea11fcebe987d42e0e97de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d0f3799612b81e85b87241ec8eee68.png)
(i)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2e776ad6950e993ce1e4430ab36255.png)
(ii)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d0f3799612b81e85b87241ec8eee68.png)
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解题方法
5 . 对于数列
,数列
称为数列
的差数列或一阶差数列.
差数列的差数列,称为
的二阶差数列.一般地,
的
阶差数列的差数列,称为
的
阶差数列.如果
的
阶差数列为常数列,而
阶差数列不是常数列,那么
就称为
阶等差数列.
(1)已知20,24,26,25,20是一个
阶等差数列
的前5项.求
的值及
;
(2)证明:二阶等差数列
的通项公式为
;
(3)证明:若数列
是
阶等差数列,则
的通项公式是
的
次多项式,即
(其中
(
)为常实数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82c65a855b1eed9c43e6829f6c3bffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b00f4eb7f1bd2ccefbabf0c1dfa8f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432851e0d0b7a2924da29b9cc5ca1706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(1)已知20,24,26,25,20是一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
(2)证明:二阶等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a15c150d08676e53aba94e9caf45d92.png)
(3)证明:若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.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/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9583aa5f0e7f73ef6200ec50ae47a7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f989a37b5a8f2cda9a2aa2cee80a11e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe29cc4634cec994fd622023a1282af0.png)
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6 . 如图所示数阵,第
行共有
个数,第m行的第1个数为
,第2个数为
,第
个数为
,规定:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96a1efc782c7cbbbd7ccd55ae6c06c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6442c68ee525e11e798702dcca3f4ac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d80851ce143df1c3e1f7bd0bb28754d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8869622c406f60ca66f66cbf7e0f94cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c9cefa7564754d75af2709b98b559c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82123c3c62e343e06a547f58ea074bea.png)
…… … … … … …
(1)试判断每一行的最后两个数的大小关系,并证明你的结论;
(2)求证:每一行的所有数之和等于下一行的最后一个数;
(3)从第1行起,每一行最后一个数依次构成数列
,设数列
的前n项和为
是否存在正整数k,使得对任意正整数n,
恒成立?如存在,请求出k的最大值,如不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdd4f87e7e7e32d723d7e97d980db42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0623207595425920f16e76a7f8f268b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29a285201fd7e0ad70fa7431cb89a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0749c4129afc0c704155f522290b25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae0b861522b18be1753acc4474cbc9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5222268dda9dcb9b660f3cbedbb37757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f1e3925bda80e8223bf7e431585847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96a1efc782c7cbbbd7ccd55ae6c06c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6442c68ee525e11e798702dcca3f4ac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d80851ce143df1c3e1f7bd0bb28754d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8869622c406f60ca66f66cbf7e0f94cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c9cefa7564754d75af2709b98b559c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82123c3c62e343e06a547f58ea074bea.png)
…… … … … … …
(1)试判断每一行的最后两个数的大小关系,并证明你的结论;
(2)求证:每一行的所有数之和等于下一行的最后一个数;
(3)从第1行起,每一行最后一个数依次构成数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e8660fb54ba32b037b392b75316087.png)
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7 . 孟德尔在观察豌豆杂交时发现了以下规律:豌豆的各种性状是由其遗传因子决定的. 以子叶颜色为例,豌豆的子叶分黄、绿两种颜色,其中黄色为显性性状,绿色为隐性性状. 我们用
表示子叶为黄色的豌豆的遗传因子对,用
表示子叶为绿色的豌豆的遗传因子对. 当这两种豌豆杂交时,父本的其中一个遗传因子与母本的其中一个遗传因子等概率随机组合,子一代的遗传因子对全部为
,如图所示,其中
为显性遗传因子,
为隐性遗传因子. 当生物的遗传因子对中含有显性遗传因子时呈现显性性状,否则呈现隐性性状. 例如:
均指示黄色子叶,
指示绿色子叶. 我们称以上定律为孟德尔定律.
与
)进行交配得到子三代豌豆,求子三代豌豆中子叶颜色为绿色的概率.
(2)已知人的单、双眼皮性状服从孟德尔定律,其中双眼皮是显性性状,记其遗传因子对为
或
;单眼皮是隐性性状,记其遗传因子对为
. 若仅考虑眼皮性状,已知你的祖父、祖母和母亲的遗传因子对均为
:
(ⅰ)在你是双眼皮的条件下,求父亲是单眼皮的概率;
(ⅱ)祖父和祖母育有伯父、父亲、叔父和姑母三子一女,除父亲外,其余三人均与单眼皮配偶婚配并各育有一子,求你及你的三代以内父系亲属(如图)中双眼皮人数的数学期望.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95a9bdde17eba7e522d1e3850171a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b012d39bca448ca6d2f2563095af11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e122c4ec85171d39684543de1484b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b51c2660cbc2a1d78e3f00dd91d9a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b012d39bca448ca6d2f2563095af11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95a9bdde17eba7e522d1e3850171a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95a9bdde17eba7e522d1e3850171a85.png)
(2)已知人的单、双眼皮性状服从孟德尔定律,其中双眼皮是显性性状,记其遗传因子对为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c56378a35ea2dc824e60450356eba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdacfce5b9dc683d4f742b3aad24c22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2441066b8a4db9e679e4ef61ecf1da4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdacfce5b9dc683d4f742b3aad24c22b.png)
(ⅰ)在你是双眼皮的条件下,求父亲是单眼皮的概率;
(ⅱ)祖父和祖母育有伯父、父亲、叔父和姑母三子一女,除父亲外,其余三人均与单眼皮配偶婚配并各育有一子,求你及你的三代以内父系亲属(如图)中双眼皮人数的数学期望.
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解题方法
8 . 蓝莓种植技术获得突破性进展,喷洒A型营养药有--定的改良蓝莓植株基因的作用,能使蓝莓果的产量和营养价值获得较大提升.某基地每次喷洒A型营养药后,可以使植株中的80%获得基因改良,经过三次喷洒后没有改良基因的植株将会被淘汰,重新种植新的植株.
(1)经过三次喷洒后,从该基地的所有植株中随机检测一株,求-株植株能获得基因改良的概率;
(2)从该基地多个种植区域随机选取-一个,记为甲区域,在甲区域第一次喷洒A型营养药后,对全部N株植株检测发现有162株获得了基因改良,请求出甲区域种植总数N的最大可能值;
(3)该基地喷洒三次A型营养药后,对植株进行分组检测,以淘汰改良失败的植株,每组n株
,一株检测费为10元,n株混合后的检测费用为
元,若混合后检测出有未改良成功的,还需逐一检测,求n的估计值,使每株检测的平均费用最小,并求出最小值.(结果精确到0.1元)
(1)经过三次喷洒后,从该基地的所有植株中随机检测一株,求-株植株能获得基因改良的概率;
(2)从该基地多个种植区域随机选取-一个,记为甲区域,在甲区域第一次喷洒A型营养药后,对全部N株植株检测发现有162株获得了基因改良,请求出甲区域种植总数N的最大可能值;
(3)该基地喷洒三次A型营养药后,对植株进行分组检测,以淘汰改良失败的植株,每组n株
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd53124761d1cbab7c6b021f31b87400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d489d9b99fa9dd5a189ed94f6ebdbd.png)
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名校
解题方法
9 . 设
,
.如果存在
使得
,那么就说
可被
整除(或
整除
),记做
且称
是
的倍数,
是
的约数(也可称为除数、因数).
不能被
整除就记做
.由整除的定义,不难得出整除的下面几条性质:①若
,
,则
;②
,
互质,若
,
,则
;③若
,则
,其中
.
(1)若数列
满足,
,其前
项和为
,证明:
;
(2)若
为奇数,求证:
能被
整除;
(3)对于整数
与
,
,求证:
可整除
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72ea8ec0d9f8b1cfc4de834b8bfb608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87803b7cee18366b89d51799250df510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6705dba65746e1d4cac6a268b3c806ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020e12ff4f028aba3a205a95e650d72b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79bda3d07c2fef4d6af4a13ade4c743e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020e12ff4f028aba3a205a95e650d72b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4d6df2a57b7e5be32c05c10257ea6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91638bacbf4d15736d26713ba90e0fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91638bacbf4d15736d26713ba90e0fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4d6df2a57b7e5be32c05c10257ea6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0601879ae4ca9592246d135bfa48658c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383eb235f8e0ceda13367b16d29e0180.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503618b9bfb53a06f0ec6a5e427dcdbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0da20edf2714109dcfded7e212ec44a.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12059d1dac926a235ccd40c3b61b1b6.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/ed9dbd8ed61db4f1c14f6b0e5f071200.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1e4de97f8490fddcff16afe8583266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
(3)对于整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b96cdd9e003120b6102d927dbf53e39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5009ce2d56180d31204f77c871fb375c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b326965628b5d967aafe9e696fdc07.png)
您最近一年使用:0次
2024-05-19更新
|
544次组卷
|
2卷引用:山东中学联盟2024届高考考前热身押题数学试题
名校
解题方法
10 . 设点集
,从集合
中任取两个不同的点
,
,定义A,
两点间的距离
.
(1)求
中
的点对的个数;
(2)从集合
中任取两个不同的点A,
,用随机变量
表示他们之间的距离
,
①求
的分布列与期望;
②证明:当
足够大时,
.(注:当
足够大时,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3afcb129040d060714f94c0f8c48a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c6d29b3010fc1dc9cb640ad41d5b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8034add7b8011393a866a21479b62f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ebc8c7e32c1b561a908a36cfa2cbb5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ffbdfab9dff3ff41ea474f06375032.png)
(2)从集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bcb4828b16c8e845492f1a53ddd9a9.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
②证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59306134d26d7a35fd18bcdd401faeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8eed2b9b1f33517499ef35e044cd104.png)
您最近一年使用:0次
2024-05-19更新
|
641次组卷
|
3卷引用:湖南省永州市部分学校2023-2024学年高二下学期6月质量检测卷数学试题
(已下线)湖南省永州市部分学校2023-2024学年高二下学期6月质量检测卷数学试题山东省临沂市兰山区等四县区2024届高三第三次模拟考试数学试题福建省厦门双十中学2023-2024学年高二下学期第二次月考数学试卷