Sagot :

Bonjour,

27/12 + 5/4 = 9/4 + 5/4 = 13/4

56/24 - 2/3 = (8 x 7) / (8 x 3) - 2/3 = 7/3 - 2/3 = 5/3

3/7 + 12/21 = 3/7 + (3 x 4) / (3 x 7) = 3/7 + 4/7 = 7/7 = 1

11/8 - 22/16 = 11/8 - (2 x 11) / (2 x 8) = 11/8 - 11/8 = 0.