1. Вычислите: г)15 : 3/5

а) 5/9 : 2/7 д) 3:5

б) 7/18 : 14/27 e) 6:12

в) 3/7 : 21

2. Найдите значение выражения: 2/3 * 1/6 : 3/4 .
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