(x^2+y^2)(x^2-y^2）-（x+y)^2(x-y)^2 ,其中x=4,y=1

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+?) 化简y(x+y)+(x+y)(x-y)-x^2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 （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) 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 因式分解x(x+y)(x-y)-x(x+y)^2 （x-y／x+2y）³ [(x-y)^2-(x+2y)(x-2y)]/y 计算:y-x分之x+y+x-y分之y-y-x分之2x-y x^2(x-y)+(y-x) x(x-y)2-(y-x)3 【(x-y)^2+(x+y)(x-y)】除以 2x [(x-y)²+(x+y)(x-y)]除以2x 求因式分解(x-y)²-2(x-y)³和（x+y）（x-y）-x（x-y） 化简 (x+2)平方-（x-y）(y-x)是(x+y)平方-（x-y）(y-x)