Réponse :
Explications étape par étape
Bonjour
Calculer
A = 8/5 + 2/5 x 1/2
A = 8/5 + 2/2 x 1/5
A = 8/5 + 1/5
[tex]\bf{A = 9/5}[/tex]
B = 3/5 x 2/5 + 7/10
B = 6/25 + (7 x 5)/(10 x 5)
B = (6 x 2)/(25 x 2) + 35/50
B = 12/50 + 35/50
[tex]\bf{B = 47/50}[/tex]
C = 1/2 - 6/10 x 3/2 - 1/7
C = 1/2 - (2 x 3)/(2 x 5) x 3/2 - 1/7
C = 1/2 - 3/5 x 3/2 - 1/7
C = 1/2 - 9/10 - 1/7
C = (1 x 35)/(2 x 35) - (9 x 7)/(10 x 7) - (1 x 10)/(7 x 10)
C = 35/70 - 63/70 - 10/70
C = 35/70 - 73/70
C = 38/70
C = (2 x 19)/(2 x 35)
C = 19/35
D = 4/25 - (12/30 + 1/5)
D = 4/25 - (6 x 2)/(6 x 5) - 1/5
D = 4/25 - 2/5 - (1 x 5)/(5 x 5)
D = 4/25 - 10/25 - 5/25
D = 4/25 - 15/25
D = -11/25
