1.) Вычислите: 15 • ( 1 + 1/3 - 1/5) 2.) Найдите значение выражения: | 1 целая 2/7 + х | - 2 • | 2 целых 3/7 - y | при х = - 3/7, y = 2.
3.) Вычислите: 1,5 • 1,3 + 2,62
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