[(x+2y^2)^2-(x+y^2)(x-y^2)-5y^4]/(2y)^2
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
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
1、x(x-y)(x+y)-x(x+y)^2
(2x-y)^2-4(x-y)(x+2y)
x+2y+4y^2/x-y+4x^y/4y^2-x^2
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
(2x-y)²-4(x-y)(x+2y)
数学(x-y)^5*(y-x)^3*(x-y)^2
化简:(2x-y)²-4(x-y)(x+y)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)