Bonjour.
A = 5/7 + 13/28 = (4 × 5)/(4 × 7) + 13/28 = 20/28 + 13/28 = 33/28
B = 5/9 - 19/36 = (4 × 5)/(4 × 9) - 19/36 = 20/36 - 19/36 = 1/36
C = 47/56 + 3/7 = 47/56 + (8 × 3)/(8 × 7) = 47/56 + 24/56 = 71/56
D = 7/8 - 59/72 = (9 × 7)/(9 × 8) - 59/72 = 63/72 - 59/72 = 4/72 = (4 × 1)/(4 × 18) = 1/18
E = 2/12 + 5/3 = 2/12 + (4 × 5)/(4 × 3) = 2/12 + 20/12 = 22/12 = (2 × 11)/(2 × 6) = 11/6
F = 6/48 + 9/8 = 6/48 + (6 × 9)/(6 × 8) = 6/48 + 54/48 = 60/48 = (12 × 5)/(12 × 4) = 5/4
G = 4/15 + 5/3 = 4/15 + (5 × 5)/(5 × 3) = 4/15 + 25/15 = 29/15
H = 2/7 + 8/21 = (3 × 2)/(3 × 7) + 8/21 = 6/21 + 8/21 = 14/21 = (7 × 2)/(7 × 3) = 2/3
I = 7/5 - 9/45 = (9 × 7)/(9 × 5) - 9/45 = 63/45 - 9/45 = 54/45 = (9 × 6)/(9 × 5) = 6/5
En te souhaitant une bonne journée :)
