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[(x-2)/(x^2+2X)-(x-1)/(x^2+4x+4)]÷(x-4)/(x+2),
=[(x-2)/x(x+2)-(x-1)/(x+2)^2)]÷(x-4)/(x+2)
=[(x-2)(x+2)-x(x-1)](x+2)}/x(x+2)^2(x-4)
=(-4+x)/x(x+2)(x-4)
=-1/(x^2+2x)
=-1/(1)
=-1
=[(x-2)/x(x+2)-(x-1)/(x+2)^2)]÷(x-4)/(x+2)
=[(x-2)(x+2)-x(x-1)](x+2)}/x(x+2)^2(x-4)
=(-4+x)/x(x+2)(x-4)
=-1/(x^2+2x)
=-1/(1)
=-1
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