已知| y/x|=3,求分式[(x2+2*x*y+y2)*(x-y)]/[x2*y2*(x-2*y)]的值

已知2x=3y,求xy／(x2+y2)-y2／(x2-y2)的值 已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值, 已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值 已知x,y为实数,且（x2 +y2）（x2 +y2+2）=3.求x2 +y2的值 已知实数x.y满足（x2+y2）（x2+y2-1）=2,求x2+y2的值 已知x2+y2=20,x2+xy-2y2=2（x+2y）,求x+y的值 已知实数x,y满足x2+y2-2x+2y=6求x2+y2的最值 已知x-y+1,X2+Y2=25 求（x+y）2和x2-xy+y2的值 已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值 已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是 正整数x,y满足x2-y2=2xy,求x-y/x+y的值 整数x,y满足x2-y2=2xy,求x-y/x+y的值