（2x-y)^13÷(2x-y)^3÷(y-2x)^3=

化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² [2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 计算:y×(y/x)^3÷[-(x^2)/y]^-2 [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 [(2x+y)(x-3y)+y(x+3y)]÷(2x)计算, [(x-2y)²+(x+y)(3x-y)-3y²]÷2x化简。 18(x+y)^8(x-y)^7÷[3(x+y)^3(x-y)^3]^2 4x-3y/x-2y÷6y-8x/y-2x [3(x-y)^3-(y-x)^2+x-y]÷(x-y) 多项式除以单项式 [12(x+y)^3+3(x+y)(x-y)^2]÷6(x+y) [(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) （2x-y)^13÷(2x-y)^3÷(y-2x)^3=