计算,(x-y-x-y分之4y的平方

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计算,(x-y-x-y分之4y的平方

计算,(x-y-x-y分之4y的平方
计算,(x-y-x-y分之4y的平方

计算,(x-y-x-y分之4y的平方
=[(x-y)²-4y²]/(x-y)][(x+y)²-4x²]/(x+y)÷[3(x+y)(x-y)-8xy]/(x-y)
=(x²-2xy-3y²)/(x-y) ×(y²+2xy-3x²)/(x+y) ÷(3x²-8xy-3y²)/(x-y)
=(x+y)(x-3y)/(x-y) ×(y-x)(y+3x)/(x+y) ×(x-y)/(3x+y)(x-3y)
=y-x