化简x+y分之x²-y²-2X-y分之4x（x-y）+y²

化简x+y分之x²-y²-2X-y分之4x（x-y）+y²
化简x+y分之x²-y²-2X-y分之4x（x-y）+y²

化简x+y分之x²-y²-2X-y分之4x（x-y）+y²
x+y分之x²-y²-2X-y分之4x（x-y）+y²
=（x+y）（x-y）/(x+y)-(4x²-4xy+y²)/(2x-y)
=x-y-(2x-y)²/(2x-y)
=x-y-2x+y
=-x
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