x³y³·(-2/3x²y)²+(-1/3x²y)³·9xy²=x³y³·4/9*x⁴y²+(-1/27)*x^6y³·9xy²=4/9*x^7y^5-3/9*x^7y^5=1/9*x^7y^5∵x=-1,y=2∴原式=1/9*(-1)*32=-32/...