Ответы на вопрос:
15/8 * 7/9 * 24/14 = = (15*7*24)/(8*9*14) = = (5*3*7*8*3)/(8*9*7*2) = = (9*8*5*7)/(8*9*7*2) = = 5/2 = 2,5
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