中一數學題`20分嫁!!!!!!!!!!!!!

2006-11-26 11:35 pm

解下列以Y為未知的文字方程。

7(a-by)=5(a+b)

a(3y-2b)=c(d+3e)

回答 (5)

2006-11-26 11:53 pm

✔ 最佳答案

7(a-by)=5(a+b)
7a-7by=5a+5b
-7by=5a-7a+5b
y=5a-7a+5b/-7b

a(3y-2b)=c(d+3e)
3ay-2ab=c(d+3e)
3ay-2ab=cd+3ec
y=cd+3ec+2ab/3a

👍 0 👎 0

2006-11-27 4:00 am

7a-7by=5a+5b
7by=7a-5a-5b
y=(2a-5b)/(7b)

3ay-2ab=cd+3ce
3ay=cd+3ce+2ab
y=(cd+3ce+2ab)/(3a)

👍 0 👎 0

2006-11-26 11:59 pm

7a-7by = 5a+5b
7by = 7a-5a-5b
y = (7a-5a-5b)/7b
y = (2a-5b)/7b

a(3y-2b) = c(d+3e)
3y-2b = c/a(d+3e)
3y = c/a (d+3e) + 2b
y = [ c/a (d+3e) + 2b ] / 3

👍 0 👎 0

2006-11-26 11:54 pm

7a-7bx7y=5a+5b
7y=5a-7a+5b+7b
7y=-2a+12b
y=(12b-2a)/7

3ya-2ba=dc+3ec
3ya=bc+3ec+2ba
y=(bc+3ec+2ba)/3a

參考: 唔知岩唔岩架

👍 0 👎 0

2006-11-26 11:42 pm

7a-7by=5a+5b
7by=7a-5a-5b
y=(2a-5b)/(7b)

3ay-2ab=cd+3ce
3ay=cd+3ce+2ab
y=(cd+3ce+2ab)/(3a)

👍 0 👎 0