宸茬煡{(x-2)虏-(x+y)虏+y(2x-y)}梅(-2y)=2,姹
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
1、x(x-y)(x+y)-x(x+y)^2
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
y'-2y=(e^x)-x
y'+2y/x=x通解
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
(1)(x^2/x)-y-x-y
【(x-y)^2+(x+y)(x-y)】除以 2x
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,