Пошаговое объяснение:
(8+m)*12 = 8*12+m*12 = 96+12m
9*(15-c) = 9*15-9*c = 135-9c
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Пошаговое объяснение:
(8+m)*12 = 8*12+m*12 = 96+12m
9*(15-c) = 9*15-9*c = 135-9c