(-4x^2y)^3÷（-8x^3y)÷(-4x^2y^2)要过程 (x^2y)*(1/2x^3y^4)÷(1/4x^4y^3)要过程

4x-3y/x-2y÷6y-8x/y-2x 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 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 18(x+y)^8(x-y)^7÷[3(x+y)^3(x-y)^3]^2 (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 先化简再求值:[(x+3y)(x-3y)-(x+3y)^2]÷4y 【(3x-2y)^2-(4x+y)(4y-x)】÷3x 已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2} [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y 计算:y×(y/x)^3÷[-(x^2)/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。 [3(x-y)^3-(y-x)^2+x-y]÷(x-y) 多项式除以单项式