1.(16y^4-9x^4)/(-3x^2-4y^2) 2.(-2x+y)(-2x-y)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(x+3y-4)(2x-y)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
(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
{(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
(2x-y)(2x+y)-2(3x-4y)(4y+3x)