Ответ:

Пошаговое объяснение:

1) 3/7 : (-5/7) = 3/7 * (-7/5) = -3/5

2) -1. 1/13 : (-2. 4/13) = -14/13 : (-30/13) = -14/13 * (-13/30) = 14/30 = 7/15

3) 17/12 - 5/6 = 17/12 - 10/12 = 7/12

4) 5/12 - 3/4 = 5/12 - 9/12 = -4/12 = -1/3

5) 7/12 : (-1/3) = 7/12 * (-3/1) = -21/12 = -7/4 = -1. 3/4

6) -3/5 - 7/15 = -9/15 - 7/15 = -16/15 =

-1. 1/15

7) -1. 1/15 + (-1. 3/4) = -1. 1/15 - 1. 3/4 =

-1. 4/60 - 1. 45/60 = -2. 49/60