Bonjour
Calculer et écrire le résultat sous forme de fraction irréductible :
A=1/8 + 3/16 -7/4
A = (1 x 2) / (8 x 2) + 3/16 - (7 x 4) / (4 x 4)
A = 2/16 + 3/16 - 28/16
A = 5/16 - 28/16
A = - 23/16
B= 2- (2/9 - 7/18)
B = (2 x 18) / (1 x 18) - [(2 x 2) / (9 x 2) - 7/18]
B = 36/18 - (4/18 - 7/18)
B = 36/18 - 3/18
B = 33/18
B = (3 x 11) / (3 x 6)
B = 11/6
C= 10/21 × 49/15
C = 490/315
C = (35 x 14) / (35 x 9)
C = 14/9
D= 5/9 ÷ 10/3
D = 5/9 x 3/10
D = 15/90
D = (15 x 1) / (15 x 6)
D = 1/6.
