Bonjour
Réduis au même dénominateur, calcule puis simplifie lorsque c'est possible.
A= 3/4+7/6
A= 3*6/4*6+7*4/6*4
A= 18/24 + 28/24
A= 46/24
A = (2 x 23) / (2 x 12)
A = 23/12
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
G= 9/15-5/6
G = (9 x 2) / (15 x 2) - (5 x 5) / (6 x 5)
G = 18/30 - 25/30
G = - 7/30
H= 5/6-1/8
H = (5 x 4) / (6 x 4) - (1 x 3) / (8 x 3)
H = 20/24 - 3/24
H = 17/24.
