Bonjour pouvez-vous m’aider svp à cette exercice

Bonjour,

1)

25/75 = (25 x 1) / (25 x 3) = 1/3

52/78 = (26 x 2) / (26 x 3) = 2/3

- 64/- 16 = (16 x 4) / (16 x 1) = 4

- 1,5/ 7,5 = (- 1,5 x 10) / (7,5 x 10) = - 15/75 = (15 x - 1) / (15 x 5) = - 1/5

2)

A = 5/4 + 7/8

A = (5 x 2) / (4 x 2) + 7/8

A = 10/8 + 7/8

A = 17/8

B = 3/2 - 1/4

B = (3 x 2) / (2 x 2) - 1/4

B = 6/4 - 1/4

B = 5/4

C = 4 + 3/2

C = (4 x 2) / (1 x 2) + 3/2

C = 8/2 + 3/2

C = 11/2

D = 27/7 - 3

D = 27/7 - (3 x 7) / (1 x 7)

D = 27/7 - 21/7

D = 6/7

E = 4/3 x 6/8

E = 24/32

E = (8 x 3) / (8 x 4)

E = 3/4

F = 12/5 x 12/4

F = 144/20

F = (4 x 36) / (4 x 5)

F = 36/5

G = 5/7 x 3/25

G = 15/175

G = (5 x 3) / (5 x 35)

G = 3/35.