Bonsoir je n'arrive pas simplifier a l'exercices 8 merci de m'aider bonne soirée

Par exemple :

3/5 × 7/8 = (3×7)/(5×8) = 21/40  (on ne peut pas simplifier)

25/3 × 4/7 = (25×4)/(3×7) = 100/21 (on ne peut pas simplifier)

3/65 × 25/2 = (3×25)/(65×2) = 75/130 = (5×15)/(5×26) = 15/26

Bonsoir

3/5 x 7/8 = (3 x 7) / (5 x 8) = 21/40

11/7 x 1/2 = (11 x 1) / (7 x 2) = 11/14

2/3 x 4/5 = (2 x 4) / (3 x 5) =  8/15

3/4 x 5/7 = (3 x 5) / (4 x 7) = 15/28

12/7 x 5/7 = (12 x 5) / (7 x 7) = 60/49

25/3 x 4/7 = (25 x 4) / (3 x 7) = 100/21

3/5 x 8/25 = (3 x 8) / (5 x 25) = 24/125

15/11 x 22/5 = (15 x 22) / (11 x 5) = (3 x 5 x 11 x 2) / (11 x 5) = 6

15/13 x 4/5 = (15 x 4) / (13 x 5) = (3 x 5 x 4) / (13 x 5) = 12/13

3/65 x 25/2 = (3 x 25) / (65 x 2) = (3 x 5 x 5) / (5 x 13 x 2) = 15/26

15/14 x 7/5 = (15 x 7) / (14 x 5) = (5 x 3 x 7) / (2 x 7 x 5) = 3/2

26/45 x 72/65 = (26 x 72) / (45 x 65) = (13 x 2 x 4 x 9 x 2) / (5 x 9 x 13 x 5)
= 16/25

26/88 x 77/39 = (26 x 77) / (88 x 39) = (13 x 2 x 7 x 11) / (2 x 4 x 11 x 3 x 13) = 7/12

Voilà j'espère avoir pu t'aider ^^