作业帮..（5题）好的追加50!
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/20 23:43:04
..（5题）好的追加50!
there are only ten boys,ten girls and a teacher in this school .every morning,each morning,each student has to bow to other boys,girls and the teacher .so how many bowings happens every morning?
there are 31 people to attend the table tennis competition.if each athlete has to attend three times ,is that possible?
there is a ten -people round match .if every two play a game one -off ,so how many matches do they have in all?
there are 43 stations from shanghai to nanjing ,so how many kinds of tickets should be prepared by railway administration?
a boy has three flags which are red,yellow and blue.then the boy makes a signal by these flags,so how many signals can the boy make?
with 1,2,3,4,can form how many different four -digit numbers?
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there are only ten boys,ten girls and a teacher in this school .every morning,each morning,each student has to bow to other boys,girls and the teacher .so how many bowings happens every morning?
there are 31 people to attend the table tennis competition.if each athlete has to attend three times ,is that possible?
there is a ten -people round match .if every two play a game one -off ,so how many matches do they have in all?
there are 43 stations from shanghai to nanjing ,so how many kinds of tickets should be prepared by railway administration?
a boy has three flags which are red,yellow and blue.then the boy makes a signal by these flags,so how many signals can the boy make?
with 1,2,3,4,can form how many different four -digit numbers?
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1.一个学校里有10个男生,十个女生和十个老师,每天早上每个人必须向其他人鞠躬一次,每天早上总共发生几次鞠躬.
30*29=870
2.有31个人参加乒乓比赛,每个人必须参加三场是否可能.（这个我不是很理解意思.）
3.有个10人的比赛,单场淘汰制,一共有几场比赛.
10-1=9
4.在上海到南京之间有43个站点,一共要准备几种不同的火车票
43*42
5.一男孩有红的,黄的,蓝的旗帜各一面,这个男孩用这三种旗帜做信号,一共可以表达几种
这个.如果不算排列顺序的话是3+3+1=7种,算排列顺序的话是3+6+6=15种
6.用1、2、3、4可以排列几种四位数.
可重复吗.可重复的话4*4*4*4=256种,不可重复的话4*3*2*1=24
30*29=870
2.有31个人参加乒乓比赛,每个人必须参加三场是否可能.（这个我不是很理解意思.）
3.有个10人的比赛,单场淘汰制,一共有几场比赛.
10-1=9
4.在上海到南京之间有43个站点,一共要准备几种不同的火车票
43*42
5.一男孩有红的,黄的,蓝的旗帜各一面,这个男孩用这三种旗帜做信号,一共可以表达几种
这个.如果不算排列顺序的话是3+3+1=7种,算排列顺序的话是3+6+6=15种
6.用1、2、3、4可以排列几种四位数.
可重复吗.可重复的话4*4*4*4=256种,不可重复的话4*3*2*1=24