Bonjour je n'arrive pas à faire l'exercice 44 aider moi svp

A = 7/5 x 3/4
A = 21/20

B = 4/3 x 7/4
B = 28/12
B = 4 x 7 / 4 x 3
B = 7/3

C = 1/5 x 8/7
C = 8/35

D = 5 x 7/2
D = 35/2

E = 3/8 x 32
E = 96/8
E = 8 x 12 / 8 x 1
E = 12

F = 0,7/6 x 1/4
F = 0,7/24