[4y(2x-y)-2x(2x-y)]÷(2x-y)

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 1、x(x-y)(x+y)-x(x+y)^2 x^2-y^2/x+y-4x(x-y)+y^2/2x-y, [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 1.[(x-y)^2-2(y -x)]÷(x-y) (2x-y)^2-4(x-y)(x+2y) (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y (1)(x^2/x)-y-x-y x+2y+4y^2/x-y+4x^y/4y^2-x^2 2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y