Решение:
- a) (-1/3 + 1/5) - 0,6 - 0,6 : (3/4) = (-5/15 + 3/15) - 0,6 - 6/10 * 4/3 = -2/15 - 0,6 - 24/30 = -2/15 - 6/10 - 4/5 = -2/15 - 3/5 - 4/5 = -2/15 - 7/5 = -2/15 - 21/15 = -23/15
- б) 5 : (1/3 - 1/4) - 1,9 + 1/6 : (-2) = 5 : (4/12 - 3/12) - 1,9 + 1/6 * (-1/2) = 5 : (1/12) - 1,9 - 1/12 = 5 * 12 - 1,9 - 1/12 = 60 - 1,9 - 1/12 = 58,1 - 1/12 = 581/10 - 1/12 = (581 * 6 - 1 * 5) / 60 = (3486 - 5) / 60 = 3481/60
Ответ: а) -23/15; б) 3481/60.