约分 1-x^2/x^2-3x+2

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

约分 1-x^2/x^2-3x+2
约分 1-x^2/x^2-3x+2

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

1-x^2/x^2-3x+2
=(1+x)(1-x)/(x-1)(x-2)
=(x+1)/(2-x)