[(2x+y)^2-(2x-y)(2x+y)]÷2y-1/2y 化简

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 1、x(x-y)(x+y)-x(x+y)^2 (1)(x^2/x)-y-x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 [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) 化简：（2x-y)²-4(x-y)(x+y) 化简:【(2x-y)(2x+y)+y(y+6x)】÷2x 化简：[(2x-y)平方+（2x+y)(2x-y)-4x(x-y+1)]÷2x (1)(x+y)^2-(x-y)^2 1、(x-2y)(x+y) 【(x-y)^2+(x+y)(x-y)】除以 2x