bonjour
A=5/6+1/2
A= 5/6 + 3 /6
A= 8/6 = 4 /3
E=5/9-2/3
E=. 5/9 - 6/9
E=. - 1 /9
B=3/5+7/10
B= 6/10 + 7/10
B= 13/10
F=7/6-13/30
F= 35/30 - 13 /30
F= 22/30 = 11/15
C=8/3+1
C= 8/3 + 3 /3
C= 11/3
G=2-4/7
G= 14/7 - 4/7
G= 10/7
D=4+3/4
D= 16/4 + 3 /4
D = 19 /4
H = 8/9 - 5
H = 5/9 - 45/9
H = - 40/9