两道简单的约分题(x^2-2x-3)/(x^2+2x+1) (x^2+x-2)/(x+2)

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两道简单的约分题(x^2-2x-3)/(x^2+2x+1)(x^2+x-2)/(x+2)两道简单的约分题(x^2-2x-3)/(x^2+2x+1)(x^2+x-2)/(x+2)两道简单的约分题(x^2

两道简单的约分题(x^2-2x-3)/(x^2+2x+1) (x^2+x-2)/(x+2)
两道简单的约分题
(x^2-2x-3)/(x^2+2x+1) (x^2+x-2)/(x+2)

两道简单的约分题(x^2-2x-3)/(x^2+2x+1) (x^2+x-2)/(x+2)
(x^2-2x-3)/(x^2+2x+1)=[(x-3)(x+1)] / [(x+1)^2]=(x-3)/(x+1)
(x^2+x-2)/(x+2)=[(x+2)(x-1)] / (x+2)= x-1