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