Bonjour ! Je suis bloqué sur les exercices 42, 43, 44 sur les nombres rationnels. Merci d’avance

42) Exemples :
a) 4/5 = 4 * 3 / 5 * 3 = 12/15
b) 5/9 = 5 * 4 / 9 * 4 = 20/36

43) Exemples : 
a) 6/8 = 6 : 2 / 8 : 2 = 3/4
b) 10/25 = 10 : 5 / 25 : 5 = 2/5

44) Exemples : 
8/5 = 72/45
2/3 = 10/15
1/6 = 3/18

Bonjour,

4/5 = (4 x 3 )/(5 x 3) = 12/15

5/9 = (5 x 4 )/(9 x 4) = 20/36

0,5/2,6 = (0,5 x 10)/(2,6 x 10 ) = 5/26

45/25 = (9 x 5)/( 5 x 5) = 9/5

Exercice 43 :

6/8 = (6 : 2)/(8 : 2) = 3/4

10/25 = (10 : 5 )/(25 : 5) = 2/5

9/12 = (9 : 3 )/(12 : 3) = 3/4

42/14 = (42 : 14)/(14 : 14) = 3

Exercice 44 :

8/5 = 72 /45

2/3 = 10/15

1/6 = 3/18

8/12 = 32/3

6/10 = 3/5

12/27 = 4/9