五个人排队,甲不能在首位,乙不能在末位,且丙不能在第三位,有几种不同排法?64

解题思路：5支队进行单循环赛，每两队之间进行一场比赛，每支球队进行了4场比赛，共要进行比赛的次数4+3+2+1=10，每场比赛参加能加两分，（分了胜负2+0=2，不分胜负1+1=2），如果全分胜负，总得分=10×2=20，由“名次靠前的都胜了名次紧跟其后的人”得至少有4局是分胜负的，得分4×2=8，总得分为8+12=20，又由“五人得分是连续五个整数”，1+2+3+4+5=15，0+1+2+3+4=10，2+3+4+5+6=20 又9×2=18，18+2=20，所以最多9场胜局，最少1场平局，最多4场平局．

共举行了：4+3+2+1=10（场），
由“名次靠前的都胜了名次紧跟其后的人”得至少有4局是分胜负的，
得分4×2=8，总得分为8+12=20，
又由“五人得分是连续五个整数”，
所以最多9场胜局，最少1场平局，最多4场平局；
因此至少要平一场，最多为四场；
答：这次比赛最少有一场平局；最多有四场平局．

点评：
本题考点： 简单统计问题．

考点点评： 完成本题的关键是理清思路，明确比赛情况与得分之间的逻辑关系，从而得出结论．

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.

你的意思是,0.7是没中奖的概率,5个人,5次方,用1减.
但你想过吗?第一个人没中,剩下9张奖券,其中3张有奖,到第二个人的时候就变成1/3中奖,2/3不中奖,这样就不对了.因此,同样,到第3,4以及以后每个人的不中奖该率都不是0.7

因为没下雨

把20个苹果全部分给五个人,要求每人分得的数量不同,分得最多的人最多能得到（ 10）个苹果.

解题思路：因为“A、B、C、D、E五人的平均分比A、B、C三人的平均分少5分”，说明二人平均多出来的5分是补给D、E二人的分数，使之达到平均分．所以C、D二人的总分80×2=160（分），再加上A、B、C多出来的5×3=15（分），再除以2即可．

（80×2+5×3）÷2
=（160+15）÷2
=175÷2
=87.5（分）．
答：这五个人的平均分是87.5分．

点评：
本题考点： 平均数问题．

考点点评： 此题解答的关键在于明白：二人平均多出来的5分是补给D、E二人的分数，使之达到平均分．

给你拍下来了

104个

就是笔画
一人不就是3划 ,二人不就是4划,三人为5划,四人为7划,五人为6划,

我们班刚演过 ,获得了系里一等奖(孔雀东南飞 英语搞笑剧本) 虽然人物多了一个,可以有群众演员嘛
焦仲卿johnny(jforshort)刘兰芝lunch(lforshort)
焦母johnny’s mother(jmforshort)刘母lunch’s mother(lmforshort)
太守之子mayor’sson(msforshort)强盗burglars(abandc)
prologue
(j作被打状跑上台,内砸出一卷纸筒,j被打中,狼狈不堪)
j:everybody says that i’m hen pecked, but in fact,i’m a strong tiger,(小声)while my
wife is wusong.
(指着上台处的门大声道)i’m not afraid of you!
(内砸出一脸盆,j接住当成盾牌护着头)then, i’m afraid of whom!
my wife lunchi is the most famous woman in the neighbor-hood.she is braver than me,smarter than me and stronger than me .all this i donot care. i only want she to be tender than me. but she is not! having a wife like this is just like living in the hell!
(内又砸出一卷纸筒,击中j)
my god! who can help me?(下)
act1
(序幕结束时,jm作窃听状)
jm(拄拐棍上):i can!
(对门内)lunch! lunch! where are you?
l(扎着围裙,拿着锅铲,从门内跳出来):i’m here! what’s up ,mum?
jm:i have told you again and again that you should call me “my most beautiful graceful and dearest mother in law”.
l:ok.my most beautiful graceful and dearest mother-in-law, what’s up?
jm:since you married my son you have be havedso badly.you have been so rude, so brusque,so
lazy……
l:but……
jm:never interrupt me!
l:never interrupt me! since i married your son, that terrible johnny,i have been working hard all
daylong,cooking and washing. i have raised tens of thousands of pigs and ducks and chicken
and……
jm:but all those you have done arenot asvaluable as a grandson!
l(生气地挥动着锅铲):oh,you want a grandson,don’t you?(开始解围裙)go and ask your son. i’m leaving!(扯下围裙,扔在jm的脸上,下)
act2
(lm坐在台上打毛线,l拿着锅铲上)
l:mum, i’m back!
lm:you are back?why?what happened?
l:i was kicked out by my most beautiful graceful and dearest mother–in-law.
lm(惊讶,但随即露出幸灾乐祸的神情):see! i have already told you! when you insisted on
marrying that terrible johnny, i told you that he is ugly tupid and poor, but you did not listen
to me. look at yourself……
l:but,mum……
lm:never interrupt me!
l:mum,i’m not interrupting you. i just want to tell you that you are always right ok? and
i’ll marry whomever you want me to.
lm(大喜):nice girl! just now, i met the mayor’s son in the market.he said:“if your daughter
haven’t been married,i really really want to marry her!”now you are free again, i ’ll go
and tell him.(下)
l(惊愕):what? the mayor’s son?the most famous playboy in the neighbor-hood? (手中的锅
铲掉在地上)what a silly thing i have done!(下)
act3
(j睡眼惺忪上)
j(边走边道):lunch! lunch! where are mysocks?
(走了几步,在地上捡起袜子)here they are!(闻一下) er! how smelly! they are still dirty!
(突然想起)lunch has gone! i have to wash them myself.
(他的肚子似乎咕咕叫了起来)oh,i’m so hungry! but there’s no breakfast!(捡起地上的围
裙)this is what lunch always wears! i miss her so much, and her excellent cooking skill! now
she has gone.i have to cook for my mother and myself.
jm(上):where’s my breakfast? where’slunch?hasn’t she got up yet?
j:mum, can’t you remember?lunch has gone!
jm(沉吟片刻):well, to tell you the truth johnny, a son without a wife is suseless. lunch is an ice
girl,go and take her back!
j(立正敬礼):yes madam!
act4
(j开心地走着,忽然跳出来三个强盗)
a:hey you!stop and listen to us!
the road is built by me!(抬脚重重地踩在一块大石头上)
b:and i planted one tree!(亦抬脚踩在同一块石头上)
c:if you want to go by this street---(欲踩石头,但踩到了a的脚)
ab&c:give us all your money!
j(搜遍了每一个口袋,掏出1角硬币):is 1mao enough?
(三强盗晕倒状,接着三人聚在一边商量)
a:what bad luck! this guy is broken!
b:if we cannot robany money today,we will havenot thing to eat tonight!
c:i heard that the mayor’s son is going to marry miss liulanzhi next month.we can go and
rob the wedding!
a&b:good idea!
j(惊讶):what? what? lunch is going to get married? it’s impossible!
ab&c:why? a pretty girl and a richman,what a good couple!
j:but lunch is my wife! we haven’t got divorced yet!
(突然有了主意)i’ve got an idea!you are going to rob the wedding, don’tyou? i’ll go
with you. you take the money and i take the bride.
b:have you got any experience?
j:no. but i’ve got this!(j脱下鞋子从里面摸出一张支票,上书＄1,000,000)
act5
(转眼已到了婚礼之期．ms意气风发用红绸牵着新娘上,j盖着红盖头极不情愿地被拉上台)
(j和三强盗跃至台中)
abc&j:hey you! stop and listen to us!
a:the road is built by me!
b:and i planted one tree.
c:if you want to go by this street---
j:give us all your money!
(l听到j的声音,掀起了盖头)
l(惊喜万分):johnny!(不顾一切地飞奔到j的身边并躲到了的身后)
(ms大怒,挥拳向j打来．j矮身一躲,ms打中了j身后的l,l晕倒)
j(火冒三丈):how dare you beat my wife!（挥拳向ms冲去）
(j与ms混战,jm上,以拐杖击晕ms)
(j将ms胸前的新郎标志扯下戴在自己胸前)
j(扶起l,关切地问):honey, how are you?
l(哭状):i hurt a lot!
j:don’t cry baby.i’ll go and fetch the medicine. (下)
l(起身去追):wait for me! (跑下)

160乘5-158乘4

三五成群

589225=5*5*7*7*13*37,6个质因数,考虑因数1,组合出5个年龄.最大质因数为37,最小为5,5*37不可能是年龄,所以37自身为一个年龄,无需和其他数字相乘.37-12=25,正好是5*5,可以肯定25也是一个年龄；25-12=13,13也是一个年龄；13-12=1,1可能是一个年龄；37+12=49,正好是7*7,所以49必是一个年龄.这样的话,所有质因数用完,还差一个年龄,只能是1这个因数了.所以5个人年龄为1,13,25,37,49,和为125

先算5个人都不中奖的概率：0.9的五次方,记此数为A
再算只有一个人中奖的概率：0.9的四次幂乘以0.1再乘5（这个5表示从5个人里任选一个人中奖）,记此数为B
至少一个人中奖的概率：1-A
至少两个人中奖的概率：1-A-B
PS：大年初四就开始学习了,你很有前途!

cde分到其中三组中去有：4*3*2=24种
所以符合每组1人,且ab同组的共有24种
5人中先出2人有5*4/2=10种
这二人为一整体与另三人分到四组
有：4*3*2=24
所以总的有24*10=240种方法
则ab同一组概率：24/240=10%

54/120=0.45

解题思路：本题可先将589225分解质因数后，再根据五个人都属龙，即年龄相差12岁分析解答即可．

589225=1×5×5×7×7×13×37．
又只有5个人，都属龙，
则他们的龄分别是：1，13，5×5=25，37，7×7=49．
年龄和是：
1+13+25+37+49
=（1+49）×5÷2，
=50×5÷2，
=125（岁）．
即年龄和是125岁．
故答案为：125．

点评：
本题考点： 年龄问题．

考点点评： 同一属相的人的年龄差一定是12的倍数．

根据方差的意义：方差是用来衡量一组数据波动大小的量,只要数据没有倍数关系的变化,其方差就不会变；
故三年后这五人年龄的方差不变,仍是0.5．

小海赛了2盘,和小华、小明比.
我们老师讲完了

P=0.46*0.46*(0.40+0.11+0.03)*(0.40+0.11+0.03)*(0.40+0.11+0.03)=0.033
P=0.46*0.46*0.46*0.40*0.40=0.0156
P=(0.46+0.40+0.11)*(0.46+0.40+0.11)*(0.46+0.40+0.11)*(0.46+0.40+0.11)*(0.46+0.40+0.11)=0.8587
注：*代表乘号.这样的题只需将每种情况出现的概率相乘就可以了.
希望可以帮得上你.

21

3

按百分比算好了啊!
1.工时*技术分=100*10+95*9+90*8+90*7+85*6=3715
2.分别按百分比算就好了再乘上3000
A.100*10/3715*3000=807.5
B,C,D,E依次算下去好了

ABCD的效率和是1/6,BCDE的效率和是1/8,AE的效率和是1/12,所以,BCD的效率和是
（1/6+1/8-1/12）÷2=5/48,
E的效率是：1/8-5/48=1/48
E一个人干,48天才能完成.

答案：3个人.
男性占40%,总共五个人,所以男性有5*40%=2人
其余的就是女性,5-2=3人.

4÷100=4%
4%-2%=2%
2%×100=2（吨）
2吨=2000公斤
2000×2=4000（元）

那么再加多一张桌 三、五、七.个人就刚好坐满桌子.
则3,5,7,9的公倍数是315,630,945...
且这个公倍数-1 刚好整除11
桌子有129张 人数是2519人

这是组合计算 4*3/2*1=6

可以提前10-20*10÷(20+5)=2小时完成

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.

马宝玉 沉着冷静,他们对敌人的仇恨,有崇高的爱国主义、革命英雄主义精神和坚贞不屈的民族气节

五个人平均分6个苹果,每人分6个苹果的：
1÷5＝1/5,五分之一
每人得到1个苹果的几分之几
6÷5＝6/5,五分之六

四场,1-2,3-4,5,剩3人;然后1-2,剩两人；1-2剩一人

A与B相邻的排列方法有A(2,2)*A(4,4)=48种
A与B相邻,且A与C相邻的排列方法有A(2,2)*A(3,3)=12种
则A与B相邻,但A与C不相邻的不同排法有48-12=36种

是用have,因为you是第二人称,而且是对话,用一般现在时.只有第三人称单数做主语时才用has.
We just have three women. have 尽量不要省略.

i:我; m:mother; f:father; a,b,c:friends
i:I'm back!
m,f: happy birthday,dear!
i:oh, Thanks,mom,dad. Oh! My God! It's you! a! Oh,b! and c! How can you be here! Today!
a,b,c: happy birthday!
a: we are here just for your birthday!
i: Oh! thanks you! thanks you so much!
m: ok, let's have dinner.
i:wow! what a nice birthday cake! Strawberries and peach.
a:this is a present for you.open it.
b:this is my present.
c:and here is mine.your favourate dish-pork slices with fish flavor!
i: thank you so much guys! Thank you.
a:why not lighten the candles and make a wish?
i:mmm...wish all my friends good luck!(pooo)

分析：1男 李 4次 甲4次 乙4次
女 李4次 甲女4次 乙女4次
2男 李 4次 甲4次 乙3次
女 李3次 甲女4次 乙女4次
3男 李 4次 甲4次 乙3次
女 李2次 甲女3次 乙女4次
4男 李 4次 甲1次 乙3次
女 李1次 甲女2次 乙女4次
可以说一个人最多握手4次,五个人都回答不一样,那就是李夫人和同一个人握了两次手,

One day,a teacher took his pupils to a chicken farm to pay a visit.When they came near the incubator,chick just got out of its egg shell.
一天,老师带学生到养鸡场参观,当他们走近孵化器时,刚好一只小鸡破壳而出.
"It's wonderful to see a little thing come out from the egg shell,isn't it?" the teacher said.
“看见一个小生命从蛋壳里出来,岂不是很奇妙的吗?”老师说.
"Yes,sir." said one of the boys," but it would be more wonderful if we knew how a chick gets in to its eggs hell before hand."
“是的,老师.”一个男学生说,“可是,如果我们知道它是怎样事先钻进蛋壳里的那就更奇妙了.”

5个人坐5个椅子,全排列有：
5P5=5*4*3*2*1=120
其中,对号入座（1坐1号,2坐2号,3坐3号...）有唯一的一种.
所以不对号入座有120-1=119种坐法~

1、
【肯】There is a book on the desk.
【否】There isn't a book on the desk.
【疑】Is there a book on the desk?
【答】Yes,there is./No,there isn't.
2、
There is a tree in the garden.
There isn't a tree in the garden.
Is there a tree in the garden?
Yes,there is./No,there isn't.
3、
There are five people in my family.
There aren't five people in my family.
Are there five people in my family?
Yes,there are./No,there aren't.
4、
There are some flowers on the desk.
There aren't some flowers on the desk.
Are there any flowers on the desk?
Yes,there are./No,there aren't.
5、
There is one bed and two chairs in the room.
There isn't one bed and two chairs in the room.
Is there one bed and two chairs in the room?
Yes,there is./No,there isn't.
6、
There are four pens and one eraser in my schoolbag.
There aren't four pens and one eraser in my schoolbag.
Are there four pens and one eraser in my schoolbag?
Yes,there are./No,there aren't.

甲两种选择B或C
A B C
1 3 1
1 2 2
1 1 3
2 1 2
2 2 1
3 1 1
仅按人数可有6种分法

题目,规则大于人情

甲——A；乙——E；丙——B；丁——C；戊——D
Min Z=25+33+27+37+20=142小时
详细答案,看这个链接
www.syit.edu.cn/kcjs/06ycx/zlxz/05-06_B_da.doc

这个题目看上去复杂,所以可以先改变一下题目.我们假设向这堆苹果里面再添一个苹果,那么这堆苹果(n +1个)现在就可以正好被二人,三人.十人所平分.所以我们先这样算,求出2,3,……10的最小公倍数,然后用这个数减一,看看能不能被11整除,如果可以就是所求的答案,如果不能,就把这个公倍数乘以二,再减一去试试能不能整除11,一直到能够整除为止.具体数据因为现在没纸每笔,可能不能立刻给你答案,所以说了个解题方法

小题1:C
小题2:B
小题3:E
小题4:D
小题5:A

In addition to me,there were five more people.
除了我以外还有五个人
希望可以帮到你.

奇+奇+奇+偶+偶
奇+奇+奇+奇+奇
奇+偶+偶+偶+偶
有三种情况
即说奇数的人有：1,3,5个

2（x+1）+3x=17
5x=17-2
x=3
所以A的单价是4.B的单价是3