七个人站队,A在B前,B在C前,G在D前,问由多少种排法?排列组合的问题

2、3、4、5、6、7、8、9、10的最小公倍数减1另外还要能被11整除
362879个苹果

让杨志他们不起疑心 放心的去买酒

分两组，每组3人，分别上白班和夜班。还有1人只上星期一至星期五的夜班，（因为星期一至星期五有一个人一直上白班）。这两个岗位可作为机动岗位，8人每周或每月轮换上这两个机动岗位。一周有两天休息时间正好可以换班。这样所有员工都可以换着休息了。

4/5*3=12/5
2/5*7=14/5
14/5>12/5
所以不够
希望能帮你

【按人收入四六开】一队四,二队六是一队：3*0.4=1.2二队：4*0.6=2.4一队得：1000÷（1.2+2.4）×1.2=1000/3=333.33二队得：666.67一队六.二队四一队：3*0.6=1.8二队：4*0.4=1.6一队得：1000÷（1.8+1.6）×1.8=529.4...

(7+8)÷（8-7）=15（人）

可以看作是3人一桌少1人 5人一桌少1人 7人一桌少1人 9人一桌少1人 即数字为这些书的公倍数减1 5*7*9*X—1 又11人一桌正好 代入后可以被11整除 故X为8（5*7*9*8—1=2519）,共2519人

假设A-G都是对的,那么A今天周一,B今天周三,C今天周二,D今天周4567,E今天周五F今天周三G今天不是周日,只有一个对的,所以BF都不对,今天不是周三,假设A对,G也对,所以A错.同理,CE也错,假设G对,ABCD错,那么今天不是1234567,那还有周几.,所以D对 ,那么G错,所以今天
好吧别人有更简单的回答
七个人说的话,可以分别用另一种方式来表示:
A:今天是星期一.
B:今天是星期三.
C:今天是星期二.
D:今天是星期四或星期五,或星期六,或星期日.
E:今天是星期五.
F:今天是星期三.
G:今天是星期一,或星期二,或星期三,或星期四,或星期五,或星期六.
只被提到一次的日子是星期日.
所以：今天是星期日

(7+1+12)*(8+1+14)=460

你好！很高兴为你答疑解惑。

42人

我的回答你还满意吗？望采纳，谢谢!

5!*2=5*4*3*2*1*2=240种方法

3、5、7、9的最小公倍数是315
315×8-1
=2520-1
=2519人
一共2519人

可以先选3个位置排甲乙丙,有C(7,3)=35种方法
再排其他四人,有A(4,4)=24种方法
由乘法原理,共有35*24= 840种排列

3,5,7,9的最小公倍数是315
公倍数是315k(k是正整数),当人数满足315k-1且315k-1能被11整除时,符合.
这时候可以一个一个试.当k=8时,315k-1=2519
2519=11*229
所以有2519人

解题思路：两个人中有一个是六年级学生，四个人中有一个是五年级学生，七个人中有一个是四年级学生，则六年级学生是全部人数的[1/2]，五年级是全部人数的[1/4]，四年级学生是全部人数的 [1/7]，所以这6位老师占全部人数的1-[1/2]-[1/4]-[1/7]，则全部人数为：6÷（1-[1/2]-[1/4]-[1/7]）人．

6÷（1-[1/2]-[1/4]-[1/7]）
=6÷[3/28]，
=56（人）．
答：整个教室共有56人．

点评：
本题考点： 分数四则复合应用题．

考点点评： 首先根据分数的意义求得各年级人数占总数的分率是完成本题的关键．

1.7!
2.1×6!（小李第一）+1×6!（小红第一）
3.6!(两人作为一个整体)×2（左、右两种可能）
4.7!-6!×2
5.7!/7=6!

答：
3,5,7,9的最小公倍数是315
公倍数是315k(k是正整数),当人数满足315k-1且315k-1能被11整除时,符合.
这时候可以一个一个试.当k=8时,315k-1=2519
2519=11*229
所以有2519人.

烂边草帽——顶好
景德镇的瓷器——瓷(词)好
七个人睡两头-颠三倒四

设至少有x个人.
由已知可得,x是11的倍数,且x+1是3、5、7、9的倍数.
由x+1是3、5、7、9的倍数可知,x+1能被3、5、7、9的最小公倍数整除.3、5、7、9的最小公倍数为5*7*9=315
315除以11余7
630（315*2）除以11余3
由此可知,315*n/11的余数与7n/11同余.（n为自然数.）
由x是11的倍数可知,x+1/11余1.因此7n/11应该余1.解得n=8.
此时x+1=315*8.
解得x=2519.
验算：2519/3=837余2,2519/5=503余4,2519/7=359余6,2519/9=279余8,2519/11=229.满足条件.这个数是3、5、7、9的公倍数-13、5、7、9的公倍数是315 所以：人数可能是：315-1=314 315×2-1=629 315×3-1=944 315×4-1=1259315×5-1=1574315×6-1=1889315×7-1=2204315×8-1=2519.只有2519÷11=229符合答：有2519人,229张桌子.

排成等边三角形每条边3人三角形中间站一人
3天高加3条边=6排

A Conversation about Hobbies
Michael and John are on their way to the tennis court.They meet Charles and David Danny.
Michael:hi,Charlie and Dave and Danny,how is everything?
Charles:ok.Thank you.How about you?It seems like you two are going to play tennis?
John:Yes.We are gong to play tennis.Would you like to join us?We can play doubles.
David:No.Thanks.We have a football game this afternoon.But the goalie is not feeling well.Do you know anybody who could be a goalie for our team?Just for today.
Michael:I am afraid not.
Danny:Please,could you help us find one?
Charles,What’s so good about playing tennis?Why can’t you guys cancel playing tennis today and come to join us.One will be the goalie and one will cheer for us.
Michael:You know what?I took tennis classes recently and I find myself so crazy about it.I feel so energetic after playing tennis.
Charles:I don’t play tennis.I just play football.Tennis is not as exciting as football.
Danny:I agree with what Charles said.
Michael:Charlie,I am afraid I can’t agree with you at this point.
John :me neither.
Michael:It is much easier to find one tennis partner than to find a whole team of people to play football.
David:That’s true.
Charlie:But,don’t you think more people are more exciting?
Playing tennis is like playing a ping pong game.You merely play back and forth.It’s a kind of boring.
Danny:right,it is so boring.
Michael and John:Noooooooo!
Michael:When you play tennis,you can keep fit and you don’t get hurt.
John:There is too much body contact in playing football.I don’t want to be pushed,be stepped,be knocked down or……
Charles:that’s the best part of the game.
Danny:exactly!
David:well,we all learn to play smart.
Michael:Sorry.We can’t talk to you now.We have to go to our tennis club now.I can’t wait to play with John.
Charles:ok.I have to call my buddies to see who would like to be our goalie today.
Michael and John:Good luck!Bye!
Charles and David and Danny:Bye!Have a good day!
Michael John:you,too.

①12、34、56、78
②13、24、57、68
③14、23、58、67
④15、26、37、48
⑤16、25、38、47
⑥17、28、35、46
⑦18、27、36、45
顺序可以调整,不过大体上可以这么分,

设投进3个球的有x人,投进4个球的有y人,则有
因为已知进球三个或三个以上的人平均每人投进3.5个球,所以有
3x+4y+5=3.5*(2+x+y)
进四个或四个以下的人平均每人投进2.5个球,所以有
1*2+2*7+5*2+3x+4y=2.5*(12+x+y)
解得x=5, y=1
即投进3个球的5人,投进4个球的1人

设至少有x个人.
由已知可得,x是11的倍数,且x+1是3、5、7、9的倍数.
由x+1是3、5、7、9的倍数可知,x+1能被3、5、7、9的最小公倍数整除.3、5、7、9的最小公倍数为5*7*9=315
315除以11余7
630（315*2）除以11余3
由此可知,315*n/11的余数与7n/11同余.（n为自然数.）
由x是11的倍数可知,x+1/11余1.因此7n/11应该余1.解得n=8.
此时x+1=315*8.
解得x=2519.
验算：2519/3=837余2,2519/5=503余4,2519/7=359余6,2519/9=279余8,2519/11=229.满足条件

先给甲在中间5个位中选,共5种选法
甲坐稳后剩下6个位拍6个人排法有6*5*4*3*2*1
所以共5*6*5*4*3*2*1=3600

序号7人组数5人组数3人组数
11217合计68人
21512合计68人
32313合计68人
4268合计68人
53114合计68人
6349合计68人
7374合计68人
84210合计68人
9455合计68人
10536合计68人
11561合计68人
12657合计68人
13642合计68人
14723合计68人
“五个人和七个数相同”,何意?

.@@@@@@@有七个位置.第一个位子有6种可能,即A.B.C.E.F.G.第2个位置有5种可能,因为有一个人已经选了.依次类推,
6×5×4×1×3×2×1=720种

由题意知,小玲爸爸的年龄是
132÷2=66（岁）
6个学生的年龄之和也是66岁,他们的年龄是连续的偶数,满足条件的只有
6、8、10、12、14、16

设油漆工工资为X
（60*6+X）/7+7.2=X 明白不?
60*6是6个木工的钱
再+上X 油漆工的钱 (60*6+X)就是一个油漆工+六个木工得总工资了
再除以7就是 他们7个人的平均工资了
而油漆工比七个人得平均工资高7.2元 再加上7.2就是油漆工得工资了
最后解这个方程式就可以了
（60*6+X）/7+7.2=X 顺便问句你几年级啊

其实我也想知道

由题意得,这个数除3余2,除5余4,除7余6,除9余8,除11可以整除
那么说明这个数加1以后可以整除3,5,7,9
3,5,7,9的最小公倍数为3*5*7*9=945
945+1=946
946/11=86
所以一共有946个人.

解题思路：假设从第一个人到第七个人杯中牛奶分别为a₁，a₂，a₃，a₄，a₅，a₆，a₇，考虑第一、二个人和第一、二次操作：
第一次操作之后：第一个人为0，第二个人为

a1

6

+a₂．
第二次操作之后：第一个人为

a1 6 +62

6

，第二个人为0．
以此类推，进而解决问题．

假设从第一个人到第七个人杯中牛奶分别为a₁，a₂，a₃，a₄，a₅，a₆，a₇，考虑第一、二个人和第一、二次操作：
第一次操作之后：第一个人为0，第二个人为
a1
6+a₂．
第二次操作之后：第一个人为

a1
6+62
6，第二个人为0．
以后每一次操作倒入第一个人杯子的牛奶和第二个人杯子的牛奶是一样多，且后面5次操作倒入第二个人杯子的牛奶总量为a₂；因此根据差量法可得：a₂+

a1
6+62
6=a₁
所以化简得：a₁：a₂=6：5，以此类推可求得a₁：a₂：a₃：a₄：a₅：a₆：a₇=6：5：4：3：2：1：0
从而求得七个杯子的牛奶分别是：[12/6]、[10/6]、[8/6]、[6/6]、[4/6]、[2/6]、[0/6]，即2升、[5/3]升、[4/3]升、1升、[2/3]升、[1/3]升、0升．

点评：
本题考点： 逻辑推理．

考点点评： 解决此题，通过推理发现规律，根据规律，解决问题．

有区别啊
一个十分之一,一个四分之一

白雪公主的短剧,其中小矮人的话可以省略几人!
英语短剧:Snow White(白雪公主)
SW---白雪公主 Q---皇后 M---魔镜 H---猎人 P---白马王子 D---小矮人 A---小动物
（旁白）A long time ago,In a beautiful kingdom,there lived a young king and a queen,the people loved them so much; the queen died while giving birth to a girl,her name was Snow White,She was a beautiful princess.Year passed,the king got married again,The people didn’t love the new queen,because she was cruel.
One day,In the king’s palace:
----白雪出场
S.w:My name is S.w ,I am a beautiful princess,I miss my mother so much,Where is my mother?Where is my mother?
音乐起,皇后、魔镜出场
Q:I am a queen,I’m very beautiful,Where is Mirror?
Mirror,Mirror on the wall,who’s the most beautiful?
M:S.w is much more beautiful than you!
Q:Hunter,go kill S.w.
猎人出场
H:Yes,my queen
音乐起,小动物出场,追赶猎人,公主惊慌出逃
S.w:Help me ,help me,please,please
A:what’s wrong with you?
S.w:The hunter…hunter…
A:bite you bite you …
小动物追赶猎人下场
S.w:I am tried and hungry,oh,there is a little house ,
I will eat a little and lie down.
音乐起,7个小矮人出场,
D:1Look,somebody ate my food----
2somebody drank my water----
3someone is sleeping now----
4What a beautiful girl!----
小矮人睡觉----音乐起公主先醒了----小矮人醒了----对话
5How do you do?
S.w:How do you do?My name is S.w …
Nice to meet you!
D:（齐说）Nice to meet you ,too----
6 welcome to our house!----
7Would you like to live here?
S.w:My pleasure,thank you very much!
D:Let’s go out for our work,bye-bye,S.W
皇后、魔镜出场
Q:Mirror,mirror on the wall,
who’s the most beautiful?
M:S.w is much more beautiful than you!
Q:What?S.w is not dead?
Hahaha,I got a good idea!
音乐起,皇后扮演老太太出场,对话
Q:Apple ,apple,beautiful apple,
S.w:Hello,Good morning grandma!
Q:pretty girl ,would you like a bite?
S.w:Oh,yes ,thank you grandma!
白雪公主咬一口后倒地
Q:The girl is dead!Hahaha…
小矮人出场、围着公主哭
S.w wake up,wake up…
音乐起,动物引着王子出场
P:A beautiful girl!She shall be my queen!
王子吻公主,公主醒了

104个

什么内容的啊,有什么限制说一下吧.这样写起来比较符合你们的具体情况

等边三角形 中间一个 三角各一个 三边中点各一个 中间的是等边三角形三心的交点
图在这个上面画不出来

先算5个男生,排列有5!=120种,再算女生,在男生中插队,两头不能站,所有只有4个空位可以插队,而女生不能相邻,所以4个分给3个女生,有4*3*2=24种,24*120=2880先算除了甲乙丙的剩下4人,有4!=24种,然后甲乙丙还是插队站,由于不相邻,所以每个空还是只能站1人,总共5个空,5选3排列,有5*4*3=60种,24*60=1440既然每个盒子都不空而且球是一样的,我们先给每个盒子放一个.然后,问题变成,把5个相同的球放进5个盒子里,这没有特别好的计算方法,枚举吧.（5,0,0）,（4,1,0）,（3,2,0）,（3,1,1）,（2,2,1）,其中,有一个数字重复的,对应3种,而其中有（5,0,0）,（3,1,1）,（2,2,1）,共9种,没有数字重复的,对应6种,所以有12种,共21种方法望采纳,谢谢

6+5+4+3+2+1=21种

可以转化为
从7个人中任意挑2个人出来进行握手,有几种情况?
这样就很简单了,7个人中任意挑2个人,有C72 不好打
就是C的上标是2下标是7种选法 也就是 (7*6)/(1*2)=21
答案就是21.

设每人分a元,一共有(7a+7)元
7a+7=8a-8
a=15元
一共有：
7a+7
=7*15+7
=112元

奥数模635

当三个人座一张桌子时余两人,当五个人座一张桌子时余四人,当七个人座一张桌子时余六人,当九个人座一张桌子时余八人,可知人数是3×5×7×9的倍数-1,也就是945n-1.此数必是11的倍数.知945n被11除余1.
所以：945=11×85+10,n=10时,945n-1能被11整除.945×10-1=9449.

先把甲乙丙按顺序放好,再放第四人有4种方法,再放第5人.有5放法,第六人有六种,第七人有其中,那么4*5*6*7=840

Many years ago, one emperor, in order to dress pretty, will not hesitate to spend all his money. He did not care about his troops do not like to go to the theater, he did not like coach逛公园- except to show off his new clothes. Hour each day to change a new set of clothes. It is mentioned that he always said: "The king in the locker room."
One day, his capital to the two swindlers claiming to be woven work that can be woven out of the world's most beautiful cloth. This kind of cloth colors and patterns are not only exceptionally beautiful, and sewing clothes out there is a strange characteristic: Any foolish or incompetent person was hopeless, can not see these clothes.
"That's the best clothes!" Thought the emperor, "I wear such clothes, I can see the kingdom who are not competent; I can identify people who are smart and who is the fool. Yes, I would like to ask them to immediately woven cloth to such! "He paid a lot of cash to the two swindlers and ask them to start work immediately.
They put two loom, pretending to look at work, but they loom in the shadow of something even none. An urgent request that they give some of the most fine gold, raw silk and the best. They have these things into their own pockets, only two air-to-air in the busy looms until late at night.
"I'd like to know how well woven fabrics exactly," said the Emperor would like to. However, think of anything stupid or incompetent person can not see it on the cloth, his heart did not feel natural. He believes that there is no need for fear of his own, but still feel that first sent a person to see the progress of the work more appropriate circumstances. The whole city of people have heard about how this fabric has a magic power, so are we all like to take this opportunity to test this: their neighbors, how stupid, how stupid.
"I want to send an honest old minister to the weavers there," the emperor thought, "he can see what this fabric is, because he is very sensible on this point incompetent, and he who does not."
The good old minister of the two swindlers came to the house and saw the empty loom that they are too busy to work on.
"May God have mercy on me!" The old minister would like, he was particularly large eyes, "I did not see anything!" But he dared not saying that these exports.
The two swindlers requested that he approached at the same time pointing to the two asked him loom overhead pattern is not very beautiful, color is not very pretty. The poor old minister of the more open the eyes bigger, still can not see anything, because nothing really.
"My God!" He thought. "Do not be foolish I am? I have never doubted their own. This must not be aware of this matter. Is it you I was incompetent? Not! I can not make people know that I did not see the cloth."
"Hey, you did not point it?" A crook that is weaving.
"Oh, beautiful! Really beautiful!" Said the old minister of the side of the glasses from his side in a careful look, "What a beautiful pattern! How beautiful colors! Yes, I will be reported to the emperor, I have cloth very satisfied. "
"Ah, we listened very pleased." Liar two said in unison. So they had a rare color and a description of the pattern, but also to add more terms. Old minister listened attentively, in order to return to the emperor could still back out there. In fact, he will do so.
The two swindlers have more money, more silk and gold, said that the need for weaving. They took these things into the pockets of the whole.
But soon enough, the emperor sent another honest officials to see the progress of the work. The official head of the luck is not a minister than good: he看了又看, but the two on the loom overhead with nothing, anything he can not see.
"You look beautiful this cloth?" Asked the two swindlers. They pointed to, to describe a number of beautiful patterns - in fact they do not exist.
"I'm not stupid you!" The official thought, "This is probably there now, I do not deserve it such a good official. This is really funny, but I can not see it!" He did not see him a lot of praise of the cloth, while ensuring that he was the color of these beautiful and clever is very satisfied with the pattern. "Yes, it is really beautiful," he said to go back to the emperor.
Everyone in town talking about the beautiful fabrics.
Emperor will be very interested to see one in person. He selected a group of special delineation of the entourage - including already seen to be honest the two ministers. He would go there two to cunning liar. These two guys are fully the spirit of weaving, but also the shadow of an invisible wire.
"You do not look at this gorgeous gorgeous fabric?" Two honest officials said, "His Majesty see: how the United States and the pattern! How beautiful colors!" They pointed to the loom overhead, they believe others see fabrics.
"This is how all about?" Thought the emperor. "I did not see anything! That the appalling. Should I be a stupid people? Why can I not qualified to do the emperor it? This is the most horrible thing." "Oh, really beautiful!" Said the emperor. "I am very satisfied!"
He expressed satisfaction over his head. He carefully looked at loom like to say he did not want to see nothing. With him to all his entourage also看了又看carefully, but they did not see more than others things. Like them, like the emperor, but also said: "Oh, really beautiful!" They proposed to the emperor in this novel, the beautiful clothes made of cloth, wearing these clothes to take part in the procession at the ceremony is about. "This fabric is gorgeous! Exquisite! The unique!" Echo of everyone. Tell everyone happy. The Emperor gave each a liar, "Royal appointment weaving division" of the title, sealing them to jazz, and can be linked to an award of the Medal in the buttonhole.
The next morning, the procession ceremony will be held. The night of the first day, two swindlers night for more than 16 points from the candle. People can see that night they are in a hurry, it is necessary to the completion of the emperor's new clothes. They pretended to remove from the loom fabric shears with two CD in the air for a while, at the same time with no threading a sewing needle pass. Finally, they said in unison: "See! Good sewing new clothes!"
The emperor himself with a group of the most noble knights come. The two swindlers raised one hand, it seems like anything with a. They said: "Please look at it, this is pants, this is the gown, which is a coat." "It's like a spider's web, like soft clothes, wearing them will feel as if nothing like this is these clothes advantages. "
"Is also pretty good," Knight said all. But they could not see anything, because what does not.
"Now please take off their clothes the emperor," two swindlers said, "so that we in the large mirror in front of you put on new clothes."
Emperor to all his clothes off. Two swindlers pretended to put one by one they have just seam to give him a good new clothes. Them around his waist get there for a while, I think it was a tie on something like: This is after裾(Note: after裾(Slaebet) is dragging behind in a long dress of a piece of cloth; it is feudal an era of aristocratic dress in Europe.).转了转before the emperor himself in the mirror, twisted the扭腰.
"God, how these clothes fit ah! Conference ah how nice!" Everyone says that. "What a beautiful pattern! How beautiful colors! This is really expensive clothes!"
"Everyone is waiting outside, ready for the canopy in order to give His Majesty the head in a ceremony to participate in the procession." Ceremony official said.
"Yes, I have put the." King said, "It All my clothes are you?" So he put himself in the mirror before turning a bit, because he make you see that he carefully watched his beautiful lift.
After those who will be holding in the Hill裾hands are touching the floor East West touch, as if they are picked up after裾like. They started walking, holding the hands of the air - they did not dare make瞧出They really did not see anything.
In this way, the emperor in the procession under the rich canopy up. Standing on the street and people say that the window of the house: "Good! Emperor's New Clothes is beautiful! His shirt after the following裾how beautiful! This dress is really All his!" People who do not want to know what can not see anything because it will show their own incompetence, or too stupid. All the emperor's clothes have never received such praise.
"But he did not wear the clothes my children!" Finally, a child called out loud.
"God, yo, you listen to the voices of the innocent!" Said his father. So we put the children privately whispered words spread.
"He did not what to wear! Have a child that he did not what to wear it!"
"He is not what to wear it!" All the people the final say. Emperor trembled a bit, because he felt that people say they have seems to be true. However, such a mind of his own thinking: "I have to hold this ceremony completed the procession." Therefore, he assumed a more proud of the air, he's in Jackson were walking behind him, holding hands after a dress that does not exist .
【可能有点长,但我已经删剪了.你看一下角色吧】
Hope can help you!

1+2+3+4+5+6=21个队 21*3=63个游戏

这个要靠协商,要集体荣誉感,很难从管理方面来做,其实也可以感化,每天你帮他们叠辈子,然后做卫生,一个星期,如果他们能自觉,那么以后会很好了.否则都是自私的,怎么搞逗搞不好了.

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