первое действие:
(1/(x+3)^2)/(x/x^2-9)=(1/(x+3)^2)*((x-3)(x+3)/x)=(x-3)/(x(x+3))
второе действие:
(x-3)/(x(x+3))-(х-9)/(x^2-9)=(x^2-3x-3x+9-x^2+9x)/(x(x+3)(x-3))=(3x+9)/(x(x-3)(x+3))=(3(x+3))/(x(x-3)(x+3))=3/x(x-3)
первое действие:
(1/(x+3)^2)/(x/x^2-9)=(1/(x+3)^2)*((x-3)(x+3)/x)=(x-3)/(x(x+3))
второе действие:
(x-3)/(x(x+3))-(х-9)/(x^2-9)=(x^2-3x-3x+9-x^2+9x)/(x(x+3)(x-3))=(3x+9)/(x(x-3)(x+3))=(3(x+3))/(x(x-3)(x+3))=3/x(x-3)