(-x^2y)^3/(xy)^3*(-2x^3y^2)^3=-x^6y^3/x^3y^3×(-8x^9y^6)=8x^12y^6 -(5x^2y+4xy^2+xy)/xy=-5x-4y-1 先求值在化简：（x^5+3x^3)/x^3-(x+1)^2,其中x=-1/2（x^5+3x^3)/x^3-(x+1)^2,=x²+3-x²-2x-1=-2x+2当x...