又有小6方程唔識~教下我得唔得呀?

設大數為X，
則小數為X-9︰
X(4/5)-(X-9)=6
4X-5(X-9)=6(5)
4X-5X+45=30
-X=-15
X=15
所以大數是15

大=x,小=x-9

五分之四x-(x-9)=6
五分之四x=6+(x-9)
五分之四x=6+x-9
五分之四x=x-3
五分之一x=3
x=15

設x係小數,大數係x+9

(x+9)既五分之四-x=6
(4x+36)/5-x=6
4x+36-5x=30
-x= -6
x=6

2006-12-24 12:30:37 補充：
差d計錯野大數係x 9 =6 9=15

Let the larger no be x, and the smaller no be y,

x - y = 9 ----- (1)
4x/5 - y = 6 ------ (2)

(1) - (2)

1x/5 = 3
x = 15
y = 6

the large no is 15

Let x be the bigest no.

4/5x-(x-9)=6
4/5x-x+9=6
-1/5x=6-9
-1/5x= -3
x= -3/-1/5
x= -3*-5
x=15

The bigest no. is 15

x-9
=15-9
=6
The smallest no. is 6

therefor
15*4/5-6
=12-6
=6

The bigest no. is 15 is correct!!

let 大數 be x, 小數 be y

x-y=9
y=x-9

4/5x - y = 6
4/5x-(x - 9) = 6
1/5x = 9-6
1/5x = 3
x=15

所以大數是15