分式约分x^3-4xy^2/-x^3-4x^2y-4xy^2

问题描述:

分式约分x^3-4xy^2/-x^3-4x^2y-4xy^2

x^3-4xy^2/-x^3-4x^2y-4xy^2
=x(x²-4y²)/-x(x²+4xy+4y²)
=(x+2y)(x-2y)/-(x+2y)²
=(2y-x)/(2y+x)