Задание 1. Найдите значение выражения: 1) (1/12 - 17/15) * 10/3; 2) (7/15 + 19/30) * 9/11; 3) (3/25 - 2/35) * 14; 4) (1/30 + 7/10) * 6

1) (1/12 - 17/15) * 10/3 = (5/60 - 68/60) * 10/3 = (-63/60) * 10/3 = (-21/20) * 10/3 = -210/60 = -7/2 = -3,5 2) (7/15 + 19/30) * 9/11 = (14/30 + 19/30) * 9/11 = (33/30) * 9/11 = (11/10) * 3/1 = 3/2 * 3/1 = 9/10 = 1,5 3) (3/25 - 2/35) * 14 = (21/175 - 10/175) * 14 = (11/175) * 14 = 154/175 = 22/25 = 0,88 4) (1/30 + 7/10) * 6 = (1/30 + 21/30) * 6 = (22/30) * 6 = (11/15) * 6 = 66/15 = 22/5 = 4,4