把公式的主項變換為y

2007-03-21 3:02 am

把公式 x(y-2)=y+1 的主項變換為y

回答 (4)

2007-03-21 3:05 am

✔ 最佳答案

x(y-2)=y+1
xy - 2x = y + 1
xy = y + 1 + 2x
xy - y = 2x + 1
y( x - 1 ) = 2x + 1
y = ( 2x+1 ) / ( x-1 ) //

參考: me~

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2007-03-21 3:24 am

x(y-2)=y+1
xy-2x=y+1
xy-y=1+2x
y(x-1)=1+2x
y=(1+2x)over(x-1)

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2007-03-21 3:12 am

x(y-2)=y+1
xy-2x=y+1
xy-y=2x+1
y(x-1)=2x+1
y=2x+1/x-1

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2007-03-21 3:10 am

先將公式 expand

x(y-2) = y+1
xy-2x = y+1

再把所有有 y 的都放到其中一邊

xy-2x = y+1
xy-y = 2x+1

再 factorize

xy-y = 2x+1
y(x-1) = 2x+1

y = (2x+1)/(x-1)

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