（x^3y）^-2×（x^-2×y^2)^21

2（x-y）²-3(x-y)(-y-x) 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 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 计算（x-y)^2×(x-y)^3×（y-x）×（y-x)^2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) （y-x）^4（x-y）^3+2（x-y）^6（y-x） （x-y）^3×（y-x）^4+（x-y）^2×（y-x）^5 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, x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 （x-y)(x-y)2(y-x) (x+2y-?）(x-2y+?) 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 3x+y=2 -y/x+y=123x+y=2 （-y/x）+y=12