The difference between two number is 10.If the sum of the smaller number multipied by4 and the larger number multipied by 3分1 is25,find the two numbers.
知道細個一個係5
大既係15
但要寫番條色出泥 由頭開始寫 識一d唔識一d都打出泥 唔該 好急 要快
中一方程問題!~快快快 幫手寫條色同運算過程 急要 10分
2007-10-23 2:56 am
回答 (5)
2007-10-23 3:00 am
✔ 最佳答案
1.Let the bigger number be x
the smaller number be x-10 (Since their difference is 10)
The sum of the smaller number multiplied by 4 = 4(x-10)
Larger number multiplied by 1/3 = (1/3)x
Their sum = 25
So
4(x-10) + (1/3)x = 25
12(x-10) + x = 75
12x - 120 + x = 75
13x = 195
x = 15
Smaller number = 5
Check:
5*4 = 20
15*1/3 = 5
Their sum = 25 correct
2008-02-17 1:11 am
kathy901123用不等式
2007-10-23 3:18 am
首先Let X be the smaller number
然後
4X+(X+10)/3=25 <--------式
12X+X+10=75 <------張佢擴分同通分
13X+10=75 <------張12X加X
13X=65 <------張加10搬去右面就減10,即75-10=65
X=5 <------答案如此
最後
∴The smaller number is 5, and the largest number is 5+10=15
然後
4X+(X+10)/3=25 <--------式
12X+X+10=75 <------張佢擴分同通分
13X+10=75 <------張12X加X
13X=65 <------張加10搬去右面就減10,即75-10=65
X=5 <------答案如此
最後
∴The smaller number is 5, and the largest number is 5+10=15
參考: 自己加自己嘅數學書
2007-10-23 3:10 am
let x be the larger number and y be the small number
x-y=10----(1)
4y+(1/3)x=25---(2)
from (1),x-y=10
y=x-10---(3)
put (3) into (2)
4(x-10)+(1/3)x=25
4x-40+(1/3)x=25
(13/3)x=65
x=15
put x=15 into (1)
15-y=10
y=5
so, the larger number is 15and the small number is 5
x-y=10----(1)
4y+(1/3)x=25---(2)
from (1),x-y=10
y=x-10---(3)
put (3) into (2)
4(x-10)+(1/3)x=25
4x-40+(1/3)x=25
(13/3)x=65
x=15
put x=15 into (1)
15-y=10
y=5
so, the larger number is 15and the small number is 5
2007-10-23 3:01 am
15+8就可以啦!!!
如果唔係就15+8>5+15就OK啦!!!
比我10分!
如果唔係就15+8>5+15就OK啦!!!
比我10分!
收錄日期: 2021-04-29 17:14:58
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071022000051KK02674