2-x分之x-x²-4x+4分之4-x²

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2-x分之x-x²-4x+4分之4-x²
=-x/(x-2) +(x²-4)/(x²-4x+4)
=-x/(x-2) +(x+2)(x-2)/(x-2)²
=-x/(x-2) +(x+2)/(x-2)
=2/(x-2)