一道英文奥数题.五分钟内给我的得话追20分!The group meets every month to catch up with the latest news.at today's meeting,each menber of the group shakes hands exactly once with every other person present,In total,there are 45 handsha
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一道英文奥数题.五分钟内给我的得话追20分!The group meets every month to catch up with the latest news.at today's meeting,each menber of the group shakes hands exactly once with every other person present,In total,there are 45 handsha
一道英文奥数题.五分钟内给我的得话追20分!
The group meets every month to catch up with the latest news.at today's meeting,each menber of the group shakes hands exactly once with every other person present,In total,there are 45 handshakes,Please calulate how many people are present at the meeting?
一道英文奥数题.五分钟内给我的得话追20分!The group meets every month to catch up with the latest news.at today's meeting,each menber of the group shakes hands exactly once with every other person present,In total,there are 45 handsha
一个团体每月聚会一次,在今天的聚会上,每个人都要与其他人握手一次.
已知握手次数一共45次,问参加今天聚会的有多少人?
设参加聚会的有x人
x(x-1)/2=45
x(x-1)=90
x^2-x-90=0
(x-10)(x+9)=0
x=10或x=-9（舍去）
答：参加今天聚会的有10人
握手问题
x(x-1)/2=45
x=10
So 10 people are present at the meeting
设一个有a个人，a(a-1)=45
10
10
45-1=44（人）
答：44个人