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1、原式=6x²;-6x+6-(6x²;-4x+9x-6) =6x²;-6x+6-6x²;-5x+6 =-11x+12 2、原式=(x²;y²;-4-2x²;y²;+4)/(xy) =-x²;y²;/(xy) =-xy
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