bjr vous pouvez m'aider

Bonjour,
A = 1/2 + 1/4 = 2/4 +1/4 = 3/4
B = 5/6 + 5/12 = 10/12 +5/12 = 15/12 (divisé par 3/3 = 5/4
C = 13/14 + 5/7 = 13/14 + 10/14 = 23/14
D = 3/4 + 5/24 = 18/24 + 5/24 = 23/24