[(x+y)(x-y)-(x-y)²]÷(-2y)数学高手来
[(x+y)(x-y)-(x-y)²]÷(-2y)数学高手来
数学(x-y)^5*(y-x)^3*(x-y)^2
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
数学高手来解二元一次方程x+y=635 2.4/x+40=y/0.8
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
{(x,y) |x|+|y|
x>y?x:y
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
1.[(x-y)^2-2(y -x)]÷(x-y)
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
数学计算(x²-y²)(x+y)÷(x+y)²