Répondre :
Bonjour,
7/6 + 2/3 = 7/6 + (2×2)/(3×2) = 7/6 + 4/6 = (7+4)/6 = 11/6
3/5 + 11/10 = (3×2)/(5×2) + 11/10 = 6/10 + 11/10 = (6+11)/10 = 17/10
8/9 - 1/3 = 8/9 - (1×3)/(3×3) = 8/9 - 3/9 = (8-3)/9 = 5/9
5 + 3/2 = 5/1 + 3/2 = (5×2)/(1×2) + 3/2 = 10/2 + 3/2 = (10+3)/2 = 13/2
3 - 5/7 = 3/1 - 5/7 = (3×7)/(1×7) - 5/7 = 21/7 - 5/7 = (21-5)/7 = 16/7
7/5 + 1 = 7/5 + 1/1 = 7/5 + (1×5)/(1×5) = 7/5 + 5/5 = (7+5)/5 = 12/5
13/12 + 19/48 = (13×4)/(12×4) + 19/48 = 52/48 + 19/48 = (52+19)/48 = 71/48
17/13 - 11/65 = (17×5)/(13×5) - 11/65 = 85/65 - 11/65 = (85-11)/65 = 74/65