Пошаговое объяснение:

б)

-1. 5/6 + (-3. 5/12) = -1. 5/6 - 3. 5/12 = -1. 10/12 - 3. 5/12 = -4. 15/12 = -5. 3/12 = -5. 1/4

г)

1) 5/6 * (-0,6) = 5/6 * (-6/10) = 1/1 * (-1/2) = -1/2

2) 4/5 : 1. 1/15 = 4/5 : 16/15 = 4/5 * 15/16 = 1/1 * 3/4 = 3/4

3) -1/2 - 3/4 = -2/4 - 3/4 = -5/4 = -1. 1/4