（-y/x^2)^3除以（-1/xy)^4乘（x/y^2)^2=-y^3/x^6 ÷(1/x^4y^4)×x^2/y^4=-y^3/x^6 ×x^4y^4×x^2/y^4=-y^3x^2+y^2-4x-6y+13=0x^2-4x+4+y^2-6y+9=0(x-2)^2+(y-3)^2=0那么x=2,y=3故（-y/x^2)^3除以（-1/xy)^4乘（x/y^...