Réponse :

Explications étape par étape :

1) 6/18 = (6 x 1)/(6 x 3) = 1/3

2) 100/30 = (10 x 10)/(10 x 3) = 10/3

3) 12/78 = (2 x 2 x 3)/(2 x 3 x 13) = 2/13

4) 2000/10000 = (2000 x 1)/(2000 x 5) = 1/5

5) 112/248 =(2 x 2 x 2 x 2 x 7)/(2 x 2 x 2 x 31) = 14/31

6) 396/234 = (2 x 2 x 3 x 3 x 11)/(2 x 3 x 3 x 13) = 22/13

7) 450/180 = 45/18 = (3 x 3 x 5)/(2 x 3 x 3) = 5/2

8) 147/168 = (3 x 7 x 7)/(2 x 2 x 2 x 3 x 7) = 7/8