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1.(x^2+x)/(x^2-1) 2.(x^2-9)/(x^2-61.(x^2+x)/(x^2-1)2.(x^2-9)/(x^2-6x+9)3.先化简后求值 x=5.(x^2-8x+16)/(x^2-16)都是分数来的

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