作业帮there wew N children went to a party,two of them shook hands,the number of shaking hands are M,can you show the relational expression?lily went to the English corner last sunday ,there were 9 girls,they said "hello"to one another,how many greetings w
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there wew N children went to a party,two of them shook hands,the number of shaking hands are M,can you show the relational expression?lily went to the English corner last sunday ,there were 9 girls,they said "hello"to one another,how many greetings w
there wew N children went to a party,two of them shook hands,the number of shaking hands are M,can you show the relational expression?
lily went to the English corner last sunday ,there were 9 girls,they said "hello"to one another,how many greetings were there?
billy is a member of a music club,and he took photos with all other members at the first time they met,there were 29 photos,how many members are there in the club?
mr.green and his wife got togeter with another three couples,they were asked to shake hands with others,every two of them can shake hands at most for twice,and each man mustn't shake hands with his own wife.after shaking hands,we are surpristed to find that each person has got the different number of shaking hands,how many times does mrs.green shak her hands?
there wew N children went to a party,two of them shook hands,the number of shaking hands are M,can you show the relational expression?lily went to the English corner last sunday ,there were 9 girls,they said "hello"to one another,how many greetings w
1.N个孩子去参加派对,互相两两握手,一共有M种握手方式,你能表述他们的关系吗?
N（N-1）*0.5=M
2.lily在上星期参加“英语角”那里总共9个女孩,他们互相说HELLO,总共有多少对女孩互相说HELLO?
答案根据组合得到9*8/2=36种
3.billy是一个音乐俱乐部的成员,并且她和她所遇到的所有的人照相,一共有29张,问俱乐部一共有多少个成员?
29个+billy=30
mr.green 和她的妻子和其他的3对夫妻一起,他们被要求他们互相握手,他们中的两个人握手最多两次,并且里面的男人不能和自己的妻子握手,我们奇怪地发现：每一个人握手的次数都不同,问
mrs.green握手几次?保守估计是7（最少）到14（最多）次.
孩子你读小学的吗?这些题目要用到高中的思想哦`~都是亲手写的忘采纳~