Verified answer

Пошаговое объяснение:

1)

-3/10 + (-14/15) = -3/10 - 14/15 = -9/30 - 28/30 =

-(9/30 + 28/30) = -37/30 = -1 7/30

2)

5/18 + (-7/12) = 5/18 - 7/12 = 10/36 - 21/36 =

-(21/36 - 10/36) = -11/36

3)

-1/9 - 7/8 = -8/72 - 63/72 = -(8/72 + 63/72) = -71/72

4)

-1/3 - (-7/15) = -1/3 + 7/15 = -5/15 + 7/15 =

7/15 - 5/15 = 2/15