Réponse :
A = -2/21 x 14/5 -8/5
A = -2/(3x7) x (2x7)/5 - 8/5
tu simplifies par 7
tu obtiens : A = -2/3 x 2/5 - 8/5 = -4/15 - 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 - 7/(3x2) x -2/5
C = -4/3 - 7/3 x -1/5
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) x (-3/18 + 4/18)
D = (-13/15) x (1/18)
D = -13/270
Explications étape par étape
