（x^3-2x^y)÷(-x^2)

化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² x(x-y)2-(y-x)3 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , [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 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) 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) [(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)