bonjour j ai besoin d aide svp ​

Bonjour,

Ex. 2 :

1/5 + 3/5 = (1+3)/5 = 4/5

13/9 - 6/9 = (13-6)/9 = 7/9

4/17 + 18/17 = (4+18)/17 = 22/17

3/8 + 2/8 = (3+2)/8 = 5/8

Ex. 3 :

5/7 + 9/14 = (5×2)/(7×2) + 9/14 = 10/14 + 9/14 = (10+9)/14 = 19/14

1/2 + 1/4 = (1×2)/(2×2) + 1/4 = 2/4 + 1/4 = (2+1)/4 = 3/4

1/2 - 1/6 = (1×3)/(2×3) - 1/6 = 3/6 - 1/6 = (3-1)/6 = 2/6 = (2×1)/(2×3) = 1/3

5/6 - 8,5/24 = (5×4)/(6×4) - 8,5/24 = 20/24 - 8,5/24 = 11,5/24