1. Вычислите: 33/50 * (8/15 - 9/10) + 3 * 1 4/15

1. Приведем дроби к общему знаменателю:

8/15 = 16/30, 9/10 = 27/30

16/30 - 27/30 = -11/30

33/50 * (-11/30) = -363/1500

3 * 1 4/15 = 3 * 19/15 = 57/15

-363/1500 + 57/15 = -363/1500 + 5700/1500 = 5337/1500 = 1779/500 = 3.558