數學 求甲乙原有錢數比為何?
回答 (2)
2015-05-09 4:53 am
✔ 最佳答案
設甲原有 a 元，乙原有 b 元。a - (1/4)a + (1/4)b = 2 × [b - (1/4)b + (1/4)a]
(3/4)a + (1/4)b = 2 × [(3/4)b + (1/4)a]
(3/4)a + (1/4)b = (3/2)b + (1/2)a
(3/4)a - (1/2)a = (3/2)b - (1/4)b
(1/4)a = (5/4)b
a = 5b
a/b = 5
a : b = 5 : 1
甲原有的錢 : 乙原有的錢 = 5 : 1
2015-05-09 6:15 am
設甲原有X元,乙原有Y元
3/4X+1/4Y=2(1/4X+3/4Y)
3/4X+1/4Y=2/4X+6/4Y
1/4X=5/4Y
X=5Y
X:Y=5:1
3/4X+1/4Y=2(1/4X+3/4Y)
3/4X+1/4Y=2/4X+6/4Y
1/4X=5/4Y
X=5Y
X:Y=5:1
參考: 自己
收錄日期: 2021-04-15 20:07:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150508000015KK05209