Réponse:
a =7.3/7+2.7/7= 7,3+2,7/7=10/7
b.12+6/4,1=18/4,1
c.8.1+1/3,05=9.1/3,05
d.8,1-2,1/22=6/22
e.19-12/0,8 = 7/0.8
f.7.3-0,3/5,5=7/5.5