约分:(x^2-9)/(x^2-2x-3)

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约分:(x^2-9)/(x^2-2x-3)

约分:(x^2-9)/(x^2-2x-3)
约分:(x^2-9)/(x^2-2x-3)

约分:(x^2-9)/(x^2-2x-3)
解(x^2-9)/(x^2-2x-3)
=(x+3)(x-3)/(x-3)(x+1)
=(x+3)/(x+1)

原式=(x+3)(x-3)(x-3)(x+1)
=(x-3)²(x+1)(x+3)