Bonsoir
B = 1/3 + - 5/12 + 1
B = (1 x 4) / (3 x 4) - 5/12 + (1 x 12) / (1 x 12)
B = 4/12 - 5/12 + 12/12
B = 11/12
C = 28/- 6 x - 54/49
C = - 1512/294
C = (42 x - 36) / (42 x 7)
C = - 36/7.
Réponse :
Bonjour
Explications étape par étape
B = 1/3 X 4/4 -5/12 +1 X 12/12
B = 4/12 -5/12 +12/12
B = 16/12 -5/12
C = 28/- 6 X - 54/-49
C = -152/294
C = -504/98 = -252/49 = - 36/7
