Bonjour,
Calculer en détaillant les étapes et donne les résultats sous forme irréductible
A=7-6×5/14
A = 7 - 30/14
A = 7 - (2 x 15) / (2 x 7)
A = 7 - 15/7
A = (7 x 7) / (1 x 7) - 15/7
A = 49/7 - 15/7
A = 34/7
B=7/6-3/5×10
B = 7/6 - 30/5
B = 7/6 - (5 x 6) / (5 x 1)
B = 7/6 - 6
B = 7/6 - (6 x 6) / (1 x 6)
B = 7/6 - 36/6
B = - 29/6
C=2/2-2/5:4/7
C = 2/2 - 2/5 x 7/4
C = 1 - 14/20
C = 1 - (2 x 7) / (2 x 10)
C = 1 - 7/10
C = (1 x 10) / (1 x 10) - 7/10
C = 10/10 - 7/10
C = 3/10
D=(3/4-8/7):(7/2-9/5)
D = [(3 x 7) / (4 x 7) - (8 x 4) / (7 x 4)] : [(7 x 5) / (2 x 5) - (9 x 2) / (5 x 2)]
D = (21/28 - 32/28) : (35/10 - 18/10)
D = 11/28 : 17/10
D = 11/28 x 10/17
D = 110/476
D = (2 x 55) / (2 x 238)
D = 55/238.
