化简(2x+y)(2x-y)-(x+2y)(x-2y-1)

1、x(x-y)(x+y)-x(x+y)^2 (1)(x^2/x)-y-x-y [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 化简：（2x-y)²-4(x-y)(x+y) 【(x-y)^2+(x+y)(x-y)】除以 2x (1)(x+y)^2-(x-y)^2 1、(x-2y)(x+y) 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 化简：[(2x-y)平方+（2x+y)(2x-y)-4x(x-y+1)]÷2x 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y x^2-y^2/x+y-4x(x-y)+y^2/2x-y,