Bonjour besoin d’aide pour l’exercice 3 et 4 !!

Réponse:

coucou

30/60 40/60 15/60 45/60 36/60 50/60

6/60 18/60 25/60

Réponse :

3.

1/2 = 30/60

2/3 = 40/60

1/4 = 15/60  

3/4= 45/60  

3/5 = 36/60

5/6 = 50/60

1/10 = 6/60

3/10 = 18/60

5/12 = 25/60  

7/15 = 28/60

9/20 = 27/60  

7/30 = 14/60

4.

a. 12/21 = 4/7 car :

12 : 3 = 4

21 : 3 = 7

b.

24/42 :

12 X 2 = 24

21 X 2 = 42

36/63 :

12 X 3 = 36

21 X 3 = 63

48/84 :

12 X 4 = 48

21 X 4 = 84

Bonne journée et bonne reprise demain !