2x^4y^3－x^3y^4=x^3y^3(2x-y)=(xy)^3(2x-y)=8×1/3=8/3
2x^4y^3－x^3y^4=x^3*y^3*(2x－y)=8/3
2x^4y^3－x^3y^4=(xy)^3(2x-y)=2^3•(1/3)=8/3
