12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
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12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
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X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系(要求一步一步写出来)
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