Verified answer

Bonjour;

1)

25/30+1/30 = 56/30 = 28/15

2)

19/28 -12/28 = 7/28 = 1/4

3)

63/81+2/81 = 65/81

4)

-3/4 -8/4 = -11/4

5)

5/6-2/6 = 3/6 = 1/2

6)

15/27 +1/27 = 16/27

7)

80/50+23/50 = 103/50

8)

31/6 -27/9 = 4/9