Y=2^x-2^-x=2 求x值

已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 已知x≠y,x^2-x=y^2-y,求x+y的值. y=3(x-y),x=2(x-y)求x,y的值 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 正数x,y满足x-y=2xy,求x-y/x+y的值. 已知:x+2y=2011 求代数式{(x^+y^)-(x-y)^+2x(x+y)}/2x的值 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 已知2/x+2/y=根号24,求 x/y(x-y) - y/x(x-y)的值 已知2/x 2/y=根号24,求 x/y(x-y) - y/x(x-y)的值 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x+y/x=11/8,求x-y/x+2y的值 求y=(x^2)+2x(x≥0) y=-x+2x(x 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 已知x-y/x=x/x-2y（y不等于0）,求x：y的值 已知x-y/x=x/x-2y(y不等于0),求x：y的值