约分4x^2-y^2/-2x-y

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约分4x^2-y^2/-2x-y约分4x^2-y^2/-2x-y约分4x^2-y^2/-2x-y4x^2-y^2/-2x-y=(2x+y)(2x-y)/[-(2x+y)]=y-2x平方差公式4x^2-

约分4x^2-y^2/-2x-y
约分4x^2-y^2/-2x-y

约分4x^2-y^2/-2x-y
4x^2-y^2/-2x-y
=(2x+y)(2x-y)/[-(2x+y)]
=y-2x

平方差公式
4x^2-y^2/-2x-y
=(2x+y)(2x-y)/[-(2x+y)]
=y-2x