Bonjour
Réduis au même dénominateur, calcule puis simplifie lorsque c'est possible.
A = 3/4 + 7/6
A = (3 x 2) / (4 x 3) + (7 x 2) / (6 x 2)
A = 6/12 + 14/12
A = 20/12
A = (4 x 5) / (4 x 3)
A = 5/3
B = 9/10 + 5/8
B = (9 x 4) / (10 x 4) + (5 x 5) / (8 x 5)
B = 36/40 + 25/40
B = 61/40
C = 9/14 + 5/6
C = (9 x 3) / (14 x 3) + (5 x 7) / (6 x 7)
C = 27/42 + 35/42
C = 62/42
C = (2 x 31) / (2 x 21)
C = 31/21
D = 5/6 + 1/8
D = (5 x 4) / (6 x 4) + (1 x 3) / (8 x 3)
D = 20/24 + 3/24
D = 23/24
E = 3/4 - 7/6
E = (3 x 3) / (4 x 3) - (7 x 2) / (6 x 2)
E = 9/12 - 14/12
E = - 5/12
F = 9/10 - 5/8
F = (9 x 4) / (10 x 4) - (5 x 5) / (8 x 5)
F = 36/40 - 25/40
F = 11/40.
