[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y

x^2-y^2/x+y-4x(x-y)+y^2/2x-y, {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y (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) x+2y+4y^2/x-y+4x^y/4y^2-x^2 4x(y-x)-y^2因式分解 (x+3y-4)(2x-y) 1、x(x-y)(x+y)-x(x+y)^2 (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2