Решение:
3b³ - 3b = 3b(b² - 1) = 3b(b² - 1²) = 3b(b - 1)(b + 1)
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Решение:
3b³ - 3b = 3b(b² - 1) = 3b(b² - 1²) = 3b(b - 1)(b + 1)