Bonjour à toi aussi !!

a.

4/3 = (4 x 14) / (3 x 14) = 56/42

11/6 = (11 x 7) / (6 x 7) = 77/42

10/7 = (10 x 6) / (7 x 6) = 60/42

12/14 = (12 x 3) / (14 x 3) = 36/42

23/21 = (23 x 2) / (21 x 2) = 46/42

47/42

Donc :

11/6 > 10/7 > 4/3 > 47/42 > 23/21 > 12/14.

b.

3/4 = (3 x 9) / (4 x 9) = 27/36

5/6= (5 x 6) / (6 x 6) = 30/36

7/9 = (7 x 4) / (9 x 4) = 28/36

8/9 = (8 x 4) / (9 x 4) = 32/36

13/18 = (13 x 2) / (18 x 2) = 26/36

31/36

Donc :

8/9 > 31/36 > 5/6 > 7/9 > 3/4 > 13/18.