Ответ:
5a - 15 / a + 4 : a² - 9 / a² - 16 = 5(a-3) × (a-4)(a+4) / (a+4) × (a-3)(a+3) = 5a - 20 / a + 3
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Ответ:
5a - 15 / a + 4 : a² - 9 / a² - 16 = 5(a-3) × (a-4)(a+4) / (a+4) × (a-3)(a+3) = 5a - 20 / a + 3