Bonjour
Effectuer les calculs suivants en écrivant les étapes nécessaires et en simplifiant les fractions.
A = 3/4 ÷ 5/7
A = 3/4 x 7/5
A = 21/20
B = - 10/4 ÷ 20/-15
B = - 10/4 x - 15/20
B = 150/80
B = (10 x 15) / (10 x 8)
C = 15/8
C = 21/-6/18/14
C = - 21/6 x 14/18
C = - 294/108
C = (6 x - 49) / (6 x 18)
C = - 49/18
D = 1/4 - 3/4 × 5/24
D = 1/4 - 15/96
D = (1 x 24) / (4 x 24) - 15/96
D = 24/96 - 15/96
D = 9/96
D = (3 x 3) / (3 x 32)
D = 3/32
E = 2/3 ÷ (4/7 - 1/21)
E = 2/3 : [(4 x 3) / (7 x 3) - 1/21)
E = 2/3 : (12/21 - 1/21)
E = 2/3 : 11/21
E = 2/3 x 21/11
E = 42/33
E = (3 x 14) / (3 x 11)
E = 14/11.
