[(x+2y)²-(x-2y)(x+2y)]÷4y
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y