Make the letter in brackets the subject of the formula.
ａ＝ｂ（ｃ＋ｄｘ） 〔ｘ〕
ｘ＝？
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急急急F.2 MATHS題題題．．．．．．．．．．．．．．．．．
2007-11-16 7:01 am
回答 (5)
2007-11-16 7:12 am
✔ 最佳答案
a = b(c+dx)a/b = c+dx
dx = (a/b) - c
dx = (a/b) - c(b/b)
dx = (a/b) - (bc/b)
dx = (a-bc)/b
x = (a - bc)/bd
參考: Me
2007-11-17 6:15 am
ａ＝ｂ（ｃ＋ｄｘ）
a/b=c+dx
a/b-c=dx
(a/b-c)/d=x
ｘ＝１／ｄ（Ａ／Ｂ－ｃ）同(a/b-c)/d=x無分別
因為１／ｄ（Ａ／Ｂ－ｃ）=(a/b-c)/d
只不過佢係寫成1除d乘(a/b-c)，而第二個直接寫(a/b-c)除d
a/b=c+dx
a/b-c=dx
(a/b-c)/d=x
ｘ＝１／ｄ（Ａ／Ｂ－ｃ）同(a/b-c)/d=x無分別
因為１／ｄ（Ａ／Ｂ－ｃ）=(a/b-c)/d
只不過佢係寫成1除d乘(a/b-c)，而第二個直接寫(a/b-c)除d
參考: myself
2007-11-16 7:05 am
a = b(c+dx)
a/b = c+dx
dx = (a/b) - c
dx = (a-bc)/b
x = (a - bc)/bd
a/b = c+dx
dx = (a/b) - c
dx = (a-bc)/b
x = (a - bc)/bd
收錄日期: 2021-04-13 18:12:22
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https://hk.answers.yahoo.com/question/index?qid=20071115000051KK04479