Пётр7 лет назад
Для наглядности подставим переменную х и найдем заданные числа.
1/3 * х = 30, х = 30 / 1/3 = 30/1 * 3/1 = 30 * 3 = 90.
1/2 * х = 18, х = 18 / 1/2 = 18/1 * 2/1 = 18 * 2 = 36.
1/7 * х= 12, х = 12 / 1/7 = 12/1 * 7/1 = 12 * 7 = 84.
1/8 * х = 15, х = 15 / 1/8 = 15/1 * 8/1 = 15 * 8 = 120.
1/2 * х = 15, х = 15 / 1/2 = 15/1 * 2/1 = 15 * 2 = 30.
1/4 * х = 18, х = 18 / 1/4 = 18/1 * 4/1 = 18 * 4 = 72.