數學難题........................分數
回答 (2)
2009-09-28 3:30 am
✔ 最佳答案
設男生有x人,則女生有(2/3)x人。x+(2/3)x=400
x=240
所以,男生有240人。
2009-09-28 3:37 am
Let the school's grils be y , school's boy be x.
400= x+y --(1)
x(2/3)=y--(2)
y=x-400-- (3)
Put (3) into (2)
x(2/3)=x-400
................................................................
do it your own. ( it is not finish )
400= x+y --(1)
x(2/3)=y--(2)
y=x-400-- (3)
Put (3) into (2)
x(2/3)=x-400
................................................................
do it your own. ( it is not finish )
參考: me
收錄日期: 2021-04-21 18:27:43
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090927000051KK01639