约分x^3-x^2-x+1/1-x^2

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约分x^3-x^2-x+1/1-x^2约分x^3-x^2-x+1/1-x^2约分x^3-x^2-x+1/1-x^2x^3-x^2-x+1/1-x^2=[x^2(1-x)-(1-x)]/(1-x^2)=

约分x^3-x^2-x+1/1-x^2
约分x^3-x^2-x+1/1-x^2

约分x^3-x^2-x+1/1-x^2
x^3-x^2-x+1/1-x^2
=[x^2(1-x)-(1-x)]/(1-x^2)
=(1-x)(x^2-1)/(1-x^2)
=-(1-x)
=x-1