（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2

化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 （x-y)(x-y)2(y-x) (x+2y-?）(x-2y+?) [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y 因式分解x(x+y)(x-y)-x(x+y)^2 （x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2 【（2x-y）（2x+y）+y（y-6x）】÷2x 计算：[（x+y）³-2(x+y)²-4(x+y)]÷（x+y) (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 [(x+2y)²-(x+y)(x-y)-7y²】÷（2y） 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 1／2x－（x+y／2x -x-y）÷（x+y) （x-2y）(x+y)+（x+y）计算 计算：（x-y）^2-(x+y)(x-y) 2（x-y）²-3(x-y)(-y-x) [（x+y）（x-y）-（x-y）²+2y（x-y）]÷（-2y）