原式=[-4x(2xy+3xy²)+12(x²y)²y³]÷(-6xy)=[-4x×2xy-4x×3xy²+12×(x²)²×y²×y³]÷(-6xy)=(-8x²y-12x²y²+12x^4y^5)÷(-6xy)=-8x²y÷(-6xy)-12x...