Réponse :
Explications étape par étape
Bonsoir
A = -2/21 x 14/5 - 8/5
A = -14/21 x 2/5 - 8/5
A = -(2 x 7)/(3 x 7) x 2/5 - 8/5
A = -2/3 x 2/5 - 8/5
A = -4/15 - 24/15
A = -28/15
B = 1/4 + 5/3 x -1/8
B = 1/4 - 5/24
B = 6/24 - 5/24
B = 1/24
C = 4/-3 + -7/6 x -2/5
C = -4/3 + 2/6 x 7/5
C = -4/3 + 1/3 x 7/5
C = -4/3 + 7/15
C = -20/15 + 7/15
C = -13/15
D = (8/15 - 7/5) x (-1/6 + 2/9)
D = (8/15 - 21/15)(-3/18 + 4/18)
D = (-13/15)(1/18)
D = -13/270
