=(x-2+4x-4-2x)/(x^2-4)

=3(x-2)/(x^2-4)

=3/(x+2)

(2)

〖(2x/x-3)-(x/x+3)〗×(x^2-9/x)

=(2x^2+6x-x^2+3x)/(x^2-9)*(x^-9)/x

=(x^2+9x)/x

=x+9