Svp aidez moi pour 2 ex de math Je suis en cinquième 5 6

a /
7/8 = 21/24
5/2 = 30/12 = 25/10
8/6 = 4/3=12/9
1/2

b / 7/4 = 14/8 =21/12=28/16=35/20=42/24

exercice 6

a /
1/3 = 2/6
b/
2/5 = 8/20
c /
2/5 = 40/100
d/
3/7 = 9/21
e/
2/4 = 4/8
f /
2/12 = 4/24
g /
9/7 = 81/63
h/
2/2.5 = 4/5
i/
3/6 = 4.5/9

deja: 5  2 = 25 10 
8 6 = 4 3