化简x+y分之x²-y²-2X-y分之4x(x-y)+y²
问题描述:
化简x+y分之x²-y²-2X-y分之4x(x-y)+y²
答
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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