Bonjour
29)
a. 3/5 = (3 x 7) / (5 x 7) = 21/35
b. 3/4 = (3 x 15) / (4 x 15) = 45/60
c. 80/100 = (80 : 20) / (100 : 20) = 40/50
d. 49/21 = (49 : 7) / (21 : 7) = 7/3
30)
a. 4/3 = 20/15
b. 5/6 = 30/36
c. 3,4/7,8 = 34/78
d. 56/24 = 7/3
e. 72/45 = 8/5.
