(6x的2次方y的3次方)的2次方/(-3x的2次方y)-(4x的3次方y的3次方)/(-4x的2次方y的2次方）=(6x²y³)²/(-3x²y)-(4x³y³)/(-4x²y²）=-12x^2*y^5-(-xy)=-12x^2*y^5+xy=xy(1-12xy^4...