Решение и ответ:
49 - 169a⁴ = 7² - 13² · (a²)² = 7² - (13a²)² = (7 - 13a²)(7 + 13a²)
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Решение и ответ:
49 - 169a⁴ = 7² - 13² · (a²)² = 7² - (13a²)² = (7 - 13a²)(7 + 13a²)