(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^2-y^2/x+y-4x(x-y)+y^2/2x-y,
(x-2y)²+(2x-4y)(x+y)+(x+y)²
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
(2x-y)^2-4(x-y)(x+2y)
1、x(x-y)(x+y)-x(x+y)^2
{(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
4x(y-x)-y^2因式分解
(x+3y-4)(2x-y)
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y