数学题(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)
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),
一道数学题:(2x-y)(2x+y)+(2x+y)²
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