Ответ:
(a²-6a+9):(a²-9)=(a-3)²÷(a-3)(a+3)= (a-3):(a+3)
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Ответ:
(a²-6a+9):(a²-9)=(a-3)²÷(a-3)(a+3)= (a-3):(a+3)