Bonjour
Calculer et donner le résultat sous forme de fraction irréductible :
A = 3/4 - 2/3 : 8/15
A = 3/4 - 2/3 x 15/8
A = 3/4 - 30/24
A = 3/4 - (6 x 5) / (6 x 4)
A = 3/4 - 5/4
A = - 2/4
A = (2 x - 1) / (2 x 2)
A = - 1/2
B = 6/5 - 17/14 : 5/7
B = 6/5 - 17/14 x 7/5
B = (6 x 14) / (5 x 14) - 119/70
B = 84/70 - 119/70
B = - 35/70
B = (35 x - 1) / (35 x 2)
B = - 1/2
C = 5/7 + 1/7 x 4/3
C = 5/7 + 4/21
C = (5 x 3) / (7 x 3) + 4/21
C = 15/24 + 4/21
C = 19/21
D = 7/15 - 4/15 x 5/8
D = 7/15 - 20/120
D = (7 x 2) / (15 x 2) - (4 x 5) / (4 x 30)
D = 14/30 - 5/30
D = 9/30
D = (3 x 3) / (3 x 10)
D = 3/10.
