(x+y)-(x-y)^3÷(x-y)(x+y)×2y化简
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
{(x,y) |x|+|y|
x>y?x:y
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
【x-3y][x+y]-[x-2y][x +2y]-[x-y
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
化简:【(2x-y)(2x+y)+y(y+6x)】÷2x
化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
(2x+3y)(3x-2y)-(x-2y)(x+2y)化简