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[tex] \frac{a - 3}{ {a}^{2} + 3a } - \frac{12}{9 - {a}^{2} } + \frac{3}{3a - {a}^{2} } [/tex]
[tex] \frac{a - 3}{ {a}^{2} + 3a } - \frac{12}{9 - {a}^{2} } + \frac{3}{3a - {a}^{2} } [/tex]
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-a^2-3a/a×(3-a)×(3+a)=
-(3+a)/(3-a)×(3+a)=
-1/3-a --- ответ