Bonsoir,
A= 4/7 + 2/7 + 1/7 + 4/4 + 5/4
= 7/7 + 9/4
= 1+ 9/4
= 1+ 2,25
= 3,25
B=
5/12 + 23/12 -5/3 - 2/3
= 28/12 - 7/3
= 7/3 -7/3 = 0
