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【免费下载】25-26学年同步培优讲义章末检测(六) 计数原理(教师版

  • 2026-02-26 06:50:41
【免费下载】25-26学年同步培优讲义章末检测(六) 计数原理(教师版

章末检测 计数原理

时间120分钟满分150

一、单项选择题本大题共8小题,每小题5分,共40分.在每小题给出的四个选项中,只有一项是符合题目要求的

1.如图所示,由电键组AB组成的串联电路中,要接通电源使电灯发光的方法有

A.4种      B.5种

C.6种 D.7种

解析C 要想通电,则需满足电路通畅,则并联电路中,至少有一个键闭合,利用分步乘法计数原理,可得共有2×36种方法.故选C.

2.abn的展开式中,只有第4项的二项式系数最大,则n=(

A.5 B.6

C.7 D.8

解析B 因为只有一项二项式系数最大,所以n为偶数,故14,即n6.

3.用数字1,2,3,4,5,6组成无重复数字的三位数,然后由小到大排成一个数列,这个数列的项数为

A.24 B.46

C.48 D.120

解析D 完成这件事需要分三步第一步确定百位数,有6种方法第二步确定十位数,有5种方法第三步确定个位数,有4种方法.根据分步乘法计数原理,共有6×5×4120三位数,所以这个数列的项数为120.故选D.

4.18m=(

A.9 B.8

C.7 D.6

解析D mm1)(m2)(m3)=18·m4,mN*,得m33,m6.

5.从乒乓球运动员男5名女6名中组织一场混合双打比赛,不同的组合方法种数为

A.B.

C.D.

解析B 分两步进行第一步,选出两名男选手,有种方法第二步,从6名女选手中选出2名且与已选好的男选手配对,有.故有.

6.x23x25的展开式中x的系数为

A.140 B.240

C.360 D.800

解析B x23x25=(x15x25,知x15的展开式中x的系数为1,(x25的展开式中x的系数为·24,常数项为25.因此原式中x的系数为·25·24240.

7.对任意的实数x,x6a0a1x21a2x22+…+a6x26,则a2=(

A.60 B.120

C.240 D.480

解析C x6[x2)+2]6x26x25·2x24·22x23·23x22·24x21·25·26,∴a2·24240.故选C.

8.定义两个正整数a,b,若它们除以正整数m所得的余数相等,则称a,b对于模m同余,记作abmodm),比如3525mod10).已知n10102103+…+1010,满足npmod7),p可以是

A.26 B.31

C.32 D.37

解析D 因为n101021031010=(11010=(7210,而n=(7210·710·79·2·7·29·210,因此n除以7的余数为·2101024除以7的余数2,而26,31,32除以7的余数分别为5,3,4,不符合题意,37除以7的余数为2,即D满足.故选D.

二、多项选择题本大题共3小题,每小题6分,共18分.在每小题给出的四个选项中,有多项符合题目要求,全部选对的得6分,部分选对的得部分分,有选错的得0分

9.下列问题属于排列问题的是

A.从10人中选2人分别去种树和扫地

B.从10人中选2人去扫地

C.从班上30名男生中选出5人组成一个篮球队

D.从数字5,6,7,8中任取两个不同的数作幂运算

解析AD 对于A,从10人中选2人分别去种树和扫地,选出的2人有分工的不同,是排列问题对于B,从10人中选2人去扫地,与顺序无关,是组合问题对于C,从班上30名男生中选出5人组成一个篮球队,与顺序无关,是组合问题对于D,从数字5,6,7,8中任取两个不同的数作幂运算,顺序不一样,计算结果也不一样,是排列问题.

10.带有编号1,2,3,4,5的五个球,则下列说法正确的是

A.全部投入4个不同的盒子里,共有45种放法

B.放进不同的4个盒子里,每盒至少一个,共有种放法

C.将其中的4个球投入4个盒子里的一个另一个球不投入),共有·种放法

D.全部投入4个不同的盒子里,没有空盒,共有·种不同的放法

解析ACD 五个球投入4个不同的盒子里共有45种放法,A选项对,若要放进不同的4个盒子里,每盒至少一个,共有·种放法,B选项错,D选项对,将其中的4个球投入4个盒子里的一个另一个球不投入),共有·种放法,C选项对,故选ACD.

11.二项式x8的展开式中x2的系数是7,则下列选项正确的是

A.aB.展开式中含x6项的系数是4

C.展开式中含x1D.展开式中常数项为40

解析AB 二项式x8的展开式的通项公式为Tr1x8rr=(-arx82r,令82r2,解得r3,所以展开式中x2的系数(-a3=-7,解得aA正确二项式x8即为x8,展开式的通项公式为Tr1x82r.82r6,解得r1,所以展开式中含x6项的系数是=-4,故B正确82r=-1,解得rx1项,故C错误82r0,解得r4,所以展开式中常数项为4D错误.故选AB.

三、填空题本大题共3小题,每小题5分,共15分.把答案填在题中横线上

12.nN*),n 4 .

解析由题意可知2n6n22n620-(n2),解得n=-4舍去n4.

13.第33届夏季奥运会预计于2024年7月26日至8月11日在法国巴黎举办,这届奥运会将新增电子竞技和冲浪两个竞赛项目以及滑板等5个表演项目.现有三个场地A,B,C分别承担竞赛项目与表演项目比赛,其中电子竞技和冲浪两个项目仅能由A,B两地承办,且各自承办其中一项.5个表演项目分别由A,B,C三个场地承办,且每个场地至少承办其中一个项目,则不同的安排方法有 300 .

解析首先电子竞技和冲浪两个项目仅能由A,B两地举办,且各自承办其中一项有2种安排再次5个表演项目分别由A,B,C三个场地承办,且每个场地至少承办其中一个项目,则有150种,故总数为2×150300种不同的安排方法.

14.已知12 024x50+(2 024x50a0a1xa2x2+…+a50x50,其中a0,a1,a2,…,a50R,若ak0,k∈{0,1,2,…,50},则实数k的最大值为 23 .

解析因为12024x50的展开式中xk的系数为·2024k,(2024x50的展开式中xk的系数为202450k(-1k,所以12024x50+(2024x50的展开式中xk的系数为2024k202450k(-1k2024k[12024502k·(-1k],k0,1,2,…,50.要使ak0,则k为奇数,且2024502k1,所以502k0,则k25,则k的最大值为23.

四、解答题本大题共5小题,共77分.解答时应写出必要的文字说明证明过程或演算步骤

15.(本小题满分13分已知n的展开式中,第4项和第9项的二项式系数相等.

1n

2求展开式中含x的项的系数.

:(1由第4项和第9项的二项式系数相等可得n11.

21知,展开式的第r1项为Tr111rr=(-2r1,得r3,此时T31=(-23x=-1320x.所以展开式中含x的项的系数为1320.

16.(本小题满分15分有2名男生和3名女生排队,按下列要求各有多少种排法,依题意列式作答

1若2名男同学不相邻,共有多少种不同的排法

2若2名男同学中间必须有1人,共有多少种不同的排法.

:(1先将3名女生进行排列,有6种情况,再将2名男生插空,有12种情况,故2名男同学不相邻,共有6×1272种排法.

2先将两名男生进行排列,有2种情况,再选出1名女生放在男同学中间,有3种情况,将两名男同学和这名女同学看成一个整体和剩余的2名女同学进行全排列,共有6种情况,故若2名男同学中间必须有1人,共有2×3×636种排法.

17.(本小题满分15分3x2y20的展开式中,求

1二项式系数最大的项

2系数绝对值最大的项.

:(1二项式3x2y20的展开式有21项,展开式的通项为Tk13x20k(-2yk,

其二项式系数最大的项为第11项,T11·3x10·(-2y10·610·x10y10.

2设系数绝对值最大的项是第k1kN*项,

解得7k8

所以k8,系数绝对值最大的项为T9·312·28·x12·y8.

18.(本小题满分17分某城市地铁公司为鼓励人们绿色出行,决定按照乘客经过地铁站的数量实施分段优惠政策,不超过12站的地铁票价如下表

乘坐站数

0x3

3x7

7x12

票价

3

5

7

现有甲乙两位乘客同时从起点乘坐同一辆地铁,已知他们乘坐地铁都不超过12站,且他们各自在每个站下地铁的可能性是相同的.

1若甲乙两人共付车费8元,则甲乙下地铁的方案共有多少种

2若甲乙两人共付车费10元,则甲比乙先下地铁的方案共有多少种

:(1若甲、乙两人共付车费8元,则其中一人乘坐地铁站数不超过3站,另外一人乘坐地铁站数超过3站且不超过7站,共有24),

故甲、乙下地铁的方案共有24.

2若甲、乙两人共付车费10元,则甲比乙先下地铁的情形有两类

第一类,甲乘地铁站数不超过3站,乙乘地铁站数超过7站且不超过12站,有15);

第二类,甲、乙两人乘地铁站数都超过3站且不超过7站,记地铁第四站至第七站分别为P4,P5,P6,P7,易知甲比乙先下地铁有以下三种情形

P4站下,乙下地铁方式有;②P5站下,乙下地铁方式有;③P6站下,乙只能从P7下地铁,共有1种方式,共有16),

依据分类加法计数原理,得15621),

故甲比乙先下地铁的方案共有21.

19.(本小题满分17分已知fx)=(1xn121xn2+…+k1xnk+…+n1x2nnN*).

1n3时,求fx的展开式中含x3项的系数

2证明fx的展开式中含xn项的系数为n1

3定义aia1a2+…+an,化简i1.

:(1n3时,fx)=(1x421x531x6,

fx的展开式中含x3项的系数为2384.

2证明:∵fx)=(1xn121xn2k1xnkn1x2nnN*),

fx的展开式中含xn项的系数为23n23n.

kk

=(n1=(n1

3i123n+(n1

i1=(n1n32

①②中分别添加1i123n+(n1

1i1=(n1n32

③+④21i1)=(n2)()=(n22n,

i1=(n22n11.

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  1. CONNECT:[ UseTime:0.000434s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000613s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000277s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000854s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000653s ]
  6. SELECT * FROM `set` [ RunTime:0.000239s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000860s ]
  8. SELECT * FROM `article` WHERE `id` = 470355 LIMIT 1 [ RunTime:0.002914s ]
  9. UPDATE `article` SET `lasttime` = 1772076186 WHERE `id` = 470355 [ RunTime:0.012238s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.004962s ]
  11. SELECT * FROM `article` WHERE `id` < 470355 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003104s ]
  12. SELECT * FROM `article` WHERE `id` > 470355 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003617s ]
  13. SELECT * FROM `article` WHERE `id` < 470355 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005372s ]
  14. SELECT * FROM `article` WHERE `id` < 470355 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011251s ]
  15. SELECT * FROM `article` WHERE `id` < 470355 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003223s ]
0.129152s