Bonjour,
Exercice 29
a= (3*7)/ (5* 7) = 21/15
b= (3*15)/ 4*15 ) = ?
c= (80/20) / (100/20) = 4/5
d= (49/7)/ ( 21/7) = ?
Exercice 30
a = 20/15
(4*5) / (3*5)
b= 30/36
c= 34/78
d= 7/3
e= 8/5