Réponse :
Bonjour,
Exercice 18 :
M = -5/16 - 3/20
M = -25+12/80
M = -37/80
N = -5/6 - (9/48 + -9/12)
N = -5/6 - (-9/16)
N = -5/6 + 9/16
N = -13/48
P = 5/4 + (4-9)/12
P = 5/4 + -5/12
P = 5/6
Q = 3/5 - -20/10 + 8/30
Q = 3/5 + 20/10 + 8/30
Q = 43/15
Voila bonne journée..