je ne comprend pas ces exercices quelqu'un peut m'aider ??​

Bonjour,

IV-

a. 2/3 = (2 x 5) / (3 x 5) = 10/15

Donc : 2/3 = 10/15

b. 3/2 = (3 x 23) / (2 x 23) = 69/46

33/23 = (33 x 2) / (23 x 2) = 66/46

Donc : 3/2 > 33/23

c. 4/5 = (4 x 7) / (5 x 7) = 28/35

Donc : 28/35 = 4/5

d. 3/7 = (3 x 9) / (7 x 9) = 27/63

Donc : 3/7 > 24/63

e. 12/11 = (12 x 12) / (11 x 12) = 144/132

110/120 = 11/12 = (11 x 11) / (12 x 11) = 121/132

Donc : 12/11 > 110/120

f. 5/9 = (5 x 6) / (9 x 6) = 30/54

Donc : 5/9 = 30/54.

V-

a. 4/5 = (4 x 3) / (5 x 3) = 12/15

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

c. 1/2 = (1 x 7) / (2 x 7) = 7/14

d. 2/5 = (2 x 4) / (5 x 4) = 8/20.