大小兩數的差是9。若從大數的五分之四減去小數，所得的差是6，求大數。
(幫我列式唔該，可以的話幫我計~我可能會唔識計~)
又有小6方程唔識~教下我得唔得呀?
2006-12-24 8:20 pm
回答 (6)
2006-12-24 8:39 pm
✔ 最佳答案
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
2006-12-24 8:29 pm
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
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
2006-12-24 8:29 pm
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
(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
參考: 我本人
2006-12-24 8:28 pm
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
x - y = 9 ----- (1)
4x/5 - y = 6 ------ (2)
(1) - (2)
1x/5 = 3
x = 15
y = 6
the large no is 15
2006-12-24 8:26 pm
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!!
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!!
2006-12-24 8:25 pm
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
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
收錄日期: 2021-04-12 23:04:19
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