maths
回答 (2)
2006-12-24 2:22 am
✔ 最佳答案
1/10(y-7)=4/5-1/2(y+9) (y-7)/10=4/5-(y+9)/2
(y-7)/10=8/10-(5y+45)/10
[(y-7)/10]+[(5y+45)/10]=8/10
(y-7+5y+45)/10=8/10
(6y+38)/10=8/10
6y+38=8
6y=-30
y=-5
參考: myself
2006-12-24 2:29 am
1/10(y - 7) = 4/5 - 1/2(y + 9)
(y - 7) / 10 + (y + 9) / 2 = 4/5
(y - 7 + 5y + 45) / 10 = 4/5
(6y + 38) / 10 = 4/5
30y + 190 = 40
30y = -150
y = -5
(y - 7) / 10 + (y + 9) / 2 = 4/5
(y - 7 + 5y + 45) / 10 = 4/5
(6y + 38) / 10 = 4/5
30y + 190 = 40
30y = -150
y = -5
收錄日期: 2021-04-29 17:21:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061223000051KK03114