【2x（x平方y-xy平方）+xy（xy（xy-x平方）】除以x平方y
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(2x(x^2y-xy^2)+xy(xy(xy-x^2)))/(x^2y)
=(2x^3y-2x^2y^2+xy(x^2y^2-x^3y))/(x^2y)
=(2x^3-2x^2y^2+x^3y^3-x^4y^2)/(x^2y)
=x^2y(2x-2y+xy^2-x^2y)/(x^2y)<----x^2y上下约掉为1
=2(x-y)+xy(y-x)
=2(x-y)-xy(x-y)
=(2-xy)(x-y)
最简Form. Done.
=(2x^3y-2x^2y^2+xy(x^2y^2-x^3y))/(x^2y)
=(2x^3-2x^2y^2+x^3y^3-x^4y^2)/(x^2y)
=x^2y(2x-2y+xy^2-x^2y)/(x^2y)<----x^2y上下约掉为1
=2(x-y)+xy(y-x)
=2(x-y)-xy(x-y)
=(2-xy)(x-y)
最简Form. Done.
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