通分,分式1/2(x+1),1/3(x+1)²1/ac,1/2ab1/x-1,2/3x3/x-2,2/6-3x1/(x+1)(x-4),2/(x-4)²x/3(y-1),2/6-6y1/(x-1)(x-2),2/x²-2x+1

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