Réponse :
bonjour
A = x + y + z
A = 5/6 - 1/24 - 7/12
A = 20/24 - 1 /24 - 14/24
A = 5 /24
B = x - y + z
B = 5/6 + 1/24 - 7/12
B = 20/24 + 1/24 - 14/24
B = 7/24
C = x - ( y + z)
C = 5/6 - ( - 1/24 - 7 /12 )
C = 20/24 - ( - 1/24 - 14/24 )
C = 20/24 - ( - 15 /24 )
C = 20/24 + 15 /24
C = 35/24
Explications étape par étape :
