Упростите выражения:
а) [tex](\frac{3}{9-x^2} + \frac{1}{x-3})/ \frac{x}{x^2-6x+9} [/tex]
б) [tex]( \frac{4}{x^2-4}+ \frac{1}{2-x})* \frac{x^2+4x+4}{3} [/tex]
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