x^2-1\x^2-2x+1化简分式
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x^2-1\x^2-2x+1化简分式
(x^2-1)/(x^2-2x+1)
=(x+1)(x-1)/(x-1)^2
=(x+1)/(x-1)
=(x+1)(x-1)/(x-1)^2
=(x+1)/(x-1)
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