(3x³y²)³÷(6x²y)²-1/3(xy)²×(1/2×x²y)=27*X^9*y^6÷(36*X^4*y^4)-1/3X^2*y^2*1/2X^2*y=3/4X^5y^2-1/3X^4y^3把x=-4,y=-1/2代入后得到3/4*1024*1/4-1/3*256*-1/8=192+32/3=608/...