Bonsoir,
a)
A= 1/3
D= 4/3
C= 7/3
B = 9/3 = 3
b)
D= 1/6
A= 4/6 = 2/3
C= 7/6
B= 11/6
c)
A= 2/3
B= 7/6
D= 8/6 = 4/3
C= 13/6
