(x-y)^2-(2x-y)^2 4x^2-nxy+9y^2
(x-y)^2-(2x-y)^2 4x^2-nxy+9y^2
(mx+y)(x-y)=2x的平方+nxy-y的平方,求m,n的值
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
1、x(x-y)(x+y)-x(x+y)^2
已知4x=9y求(1)x+y/y (2)y-x/2x
(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)
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
x+2y+4y^2/x-y+4x^y/4y^2-x^2
(1)(x^2/x)-y-x-y
4x(y-x)-y^2因式分解