解:[-2(xy)^2]^2*(y-x)^3=(-2x^2y^2)^2*[-(x³-3x²y+3xy²-y³)]=-4x^4y^4*(x³-3x²y+3xy²-y³)=-4x^4y^4*x³+4x^4y^4*3x²y-4x^4y^4*3xy²+4x^4y^4*y³=-4x^7y^4+12x^6y^5-12x^5y^6+4x^4y^7
^是什么