（4x^2y+x^3y^3）÷（-2x^2y）计算

x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 4x-3y/x-2y÷6y-8x/y-2x （y-x）^4（x-y）^3+2（x-y）^6（y-x） （x-y）^3×（y-x）^4+（x-y）^2×（y-x）^5 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) 12（x+y）^3（y-x）/【4（x+y）^2(x-y)】 2分之x+y+3分之x-y；4（x+y）-（x-y)谢谢了, 2（x-y）²-3(x-y)(-y-x) (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 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(x-y)2-(y-x)3 (x+3y-4)(2x-y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) (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 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x