FORM 2 MATHS

2007-12-15 9:22 pm

把公式主項變換為x字母

y=3x/x+2

回答 (5)

2007-12-15 9:27 pm

✔ 最佳答案

y=3x/x+2
yx+2y=3x
2y=3x-yx
2y=x(3-y)
2y/(3-y)=x
x=2y/(3-y)

hope i can help*

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2007-12-15 10:19 pm

y=3x/(x+2)
xy+2y=3x
x(y-3)=-2y
x=2y/(3-y)

參考: me

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2007-12-15 9:56 pm

其實唔難既
做多d哩d數就冇問題
答案如下::
y=3x /(x+2)
(x+2)y=3x
xy+2y=3x
3x-xy=2y <----手羅 common factor
x(3-y)=2y
x=2y / (3-y)

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2007-12-15 9:49 pm

yx=3x+2
yx-2=3x
-2=3x-yx
-2=x(3-y)
-2/(3-y)=x
x= -2/(3-y)

參考: 自己

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2007-12-15 9:32 pm

你有無打錯問題或打少了括號? 因為你打3x/x, 即係3x over x, 分子分母的x是可以相約。那便會變成 y = 5

參考: myself

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