{(x+2y)(x-2y)+[2(x-y)]²}÷6x=?
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
{(x+2y)(x-2y)+[2(x-y)]²}÷6x=?
1、x(x-y)(x+y)-x(x+y)^2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
化简:【(2x-y)(2x+y)+y(y+6x)】÷2x
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1