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Réponse:

3 = 3/1 = 15/3

7 = 7/1 = 28/4

5 = 40/8 = 15/3

2,14 = 214/100 = 107/50

5/8 = 35/56 = 15/24

20/15 = 4/3 = 24/18

7/3 = 35/15 = 42/18

22/55 = 5/11 = 40/88

2/9 = 6/27 = -8/-36

14/21 = 2/3 = -10/-15

12/30 = 2/5 = 18/45

36/24 = 6/4 = 3/2

puis il faut entourer 5/3 = 30/18 = 15/9 =25/15

Bonjour

2)

3 = 3/1 = 15/5

7 = 7/1 = 28/4

5 = 40/8 = 15/3

2,14 = 214/100 = 107/50

5/8 = 35/56 = 15/24

20/15 = 4/3 = 24/18

7/3 = 35/15 = 42/18

25/55 = 5/11 = 40/88

2/9 = 6/27 = - 8/- 36

14/21 = 2/3 = - 10/- 15

12/30 = 2/5 = 18/45

36/24 = 6/4 = 3/2

3)

5/3 = 30/18 = 15/9 = 25/15

car 30/18 = (6 x 5) / (6 x 3) = 5/3

car 15/9 = (3 x 5) / (3 x 3) = 5/3

car 25/15 = (5 x 5) / (5 x 3) = 5/3

40/12 =  (4 x 10) / (4 x 3) = 10/3

10/8 = (2 x 5) / (2 x 4) = 5/4