中1數20分
2007-10-08 3:27 am
The difference between two numbers is１０．Ｉｆthe sum of the smaller number multipiled by ４and the ｌａｒｇｅｒ number multiplied by one-thrid is ２５,find the two numberS.
回答 (2)
2007-10-08 3:33 am
✔ 最佳答案
Let x be the smaller numberLet y be the larger number
y-x=10 ----------(a)
4x+y/3=25 ------------(b)
From (a), y=10+x and put it into (b)
4x+(10+x)/3=25
12x+10+x=75
13x=65
x=5
Put x=5 into (a)
y=10+5
y=15
2007-10-07 22:00:22 補充：
係, 要用方程式
2007-10-08 3:38 am
let the smaller number is n and the larger number is m.
m-n=10---------------------(1)
4n+1/3m=25-------------(2)
(2)X3
12n+m=75---------------(3)
solving two eqt.
(3)-(1): 12n+m=75
- m-n =10
13n=65
n=5
put n=5 into(1)
m-5=10
so, m=15
So, the smaller numbers =5, larger number=15.
m-n=10---------------------(1)
4n+1/3m=25-------------(2)
(2)X3
12n+m=75---------------(3)
solving two eqt.
(3)-(1): 12n+m=75
- m-n =10
13n=65
n=5
put n=5 into(1)
m-5=10
so, m=15
So, the smaller numbers =5, larger number=15.
參考: 自己
收錄日期: 2021-04-13 19:15:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071007000051KK04800