Bonsoir,
H
4/3 -2/6 = 8/6 -2/6 = 6/6 = 1
5/4 +3/8 = 10/8 + 3/8= 13/8
1*8/13 = 8/13
I=
1/18 +2/9 = 1/18 +4/18 = 5/18
5/6 -1 = 5/6 -6/6 = -1/6
5/18 * -6/1 = -30/18 = -15/ 9 = -5/3