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)
中一數學題`20分嫁!!!!!!!!!!!!!
2006-11-26 11:35 pm
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
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)
7by=7a-5a-5b
y=(2a-5b)/(7b)
3ay-2ab=cd+3ce
3ay=cd+3ce+2ab
y=(cd+3ce+2ab)/(3a)
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
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
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
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
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)
7by=7a-5a-5b
y=(2a-5b)/(7b)
3ay-2ab=cd+3ce
3ay=cd+3ce+2ab
y=(cd+3ce+2ab)/(3a)
收錄日期: 2021-04-12 18:09:03
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