急急急F.2 MATHS題題題．．．．．．．．．．．．．．．．．

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

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）　　　　〔ｘ〕

ａ＝ｂｃ＋ｂｄｘ

ａ－ｂｃ＝ｂｄｘ

ａ－ｂｃ／ｂｄ＝ｘ

ｘ＝ａ－ｂｃ／ｂｄ

a=bc+bdx
a=b(c+dx)
a/b=c+dx
x=(a/b -c)/d

a = b(c+dx)
a/b = c+dx
dx = (a/b) - c
dx = (a-bc)/b
x = (a - bc)/bd