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Ответ:

Пошаговое объяснение:

21/45 = 7/15 (дет/мин) - производительность токаря

1) 14 : 7/15 = 14 * 15/7 = 2*15 = 30 (мин) - сделает 14 деталей

2) 1 час = 60 мин

60 * 7/15 = 4*7 = 28 (дет) - за 1 час

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