1 [（x-2y)^3]^3÷[（2y-x)^2]^4=2-（a^2b）^5÷（-a^2 b^3)=3[（x-y)^2]^3÷[(y-x)^3]^2=4(x^2y)6÷（x^2y)^3=

x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x (x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3 [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 [(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]÷x+y/3x+y/3x+y是整体.. 先化简再求值:(x+y)(x-y)+(x^2-2xy+y^2)-(x^2y)^3÷(x^2y)^2,其中x=1,y=2. 计算:y×(y/x)^3÷[-(x^2)/y]^-2 [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 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 [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)