Pouvais vous m’aidez svp je comprend pas merci

Bonsoir,

A = 3/7 x 5/4

A = 15/28

B = 1/2 x 7/2

B = 7/4

C = 7/10 x 11/100

C = 77/1000

D = 3/7 x 5/4

D = 15/28

E = 7 x 6/13

E = 42/13

F = 19/100 x 3

F = 57/100