Bonsoir,
a)
5/6 -2/6 = 3/6 = 1/3
b)
21/27 + 1/27 = 22/27
c)
-80/50 +23/50 = -57/50
d)
45/15 -35/15 = 10/15 = 2/3
e)
4/11 + 22/11 = 26/11
f)
-8/91 - 13/91 = -11/91
g)
20/8 + 90/8 +2/8 =112/8 =14
h)
196/49 + 5/49 - 56/49 =145/49
