f(x)=(x-1)/(x+1)=1-2/（x+1)是怎么化简的

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f(x)=(x-1)/(x+1)=1-2/（x+1)是怎么化简的
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f(x)=(x-1)/(x+1)=1-2/（x+1)是怎么化简的
f(x)=(x-1)/(x+1)=1-2/（x+1)是怎么化简的

f(x)=(x-1)/(x+1)=1-2/（x+1)是怎么化简的
f(x)=(x+1-2)/(x+1)
=(x+1)/(x+1)-2/(x+1)
=1-2/(x+1)

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

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

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