Bonjour pouvez-vous m'aider svp je suis en 5ème ​

Bonjour

a. 56/64 = (8x 7) / (8 x 8) = 7/8

b. 63/75 = (3x 21) / (3 x 25) = 21/25

c. 28/49 = (7 x 4) / (7 x 7) = 4/7

d. 26/74 = (2 x 13) / (2 x 37) = 13/37

e. (6 x 15) / (6 x 35) = 15/35 = (5 x 3) / (5 x 7) = 3/7

f. (18 x 21) / (45 x 21) = 18/45 = (9 x 2) / (9 x 5) = 2/5

g. (28 x 56) / (16 x 28) = 56/16 = (8 x 7) / (8 x 2) = 7/2

h. (24 x 45) / (18 x 40) = 1080/720 = (630 x 3) / (360 x 2) = 3/2.

Réponse :

Bonjour

Explications étape par étape

56/64 = 28/32 = 14/16 = 7/8

63/75 = 21/25

28/49 = 4/7

26/74 = 13/37

6 X 15 = 15/35 = 3/7

6 X 35

18 X 21 = 18/45 = 2/5

45 X 21

28 X 56 = 56/16 = 7/2

16 X 28

24 X 45 = 1080/720 = 108/72 = 12/8 = 6/4 = 3/2

18 X 40