[(x-2y)平方+(x-2y)(2y+x)-2x(2x–y)]÷2x

化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 1、x(x-y)(x+y)-x(x+y)^2 化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y) 1.(x-2y)(x+2y)-(x平方+y)(x平方-y) 2.(2x-y)(y+2x)-(2y+x)(2y-x) [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 (1)(x^2/x)-y-x-y [(x+2y)的平方-(x+y)(x-y)-5y的平方]除以(2x) 化简：[(2x-y)平方+（2x+y)(2x-y)-4x(x-y+1)]÷2x 2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方 [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 【(x-y)^2+(x+y)(x-y)】除以 2x (x-2y)(x-2y)(x平方+4y平方)的平方(x+2y)(x+2y)