Réponse :
Bonjour
Explications étape par étape
Exercice 1
A = -21/56 X 48/42
A = -1008/2352 = -336/784 = -168/392 = -84/196 = -42/98 = -21/49 = -3/7
B = 6 -5/3 +11/18
B = 6 X 18/18 -5/3 X 6/6 + 11/18
B = 108/18 -30/18 +11/18
B = 89/18
C = 8/9 : 64/27
C = 8/9 X 27/64
C = 216/576 = 24 /64 = 3/8
D = 4 +2/3 -7/6 = 4 X 6/6 +2/3 X 2/2 -7/6 = 24/6 +4/6 -7/6 = 21/6
4 -2/3 +7/6 4 X 6/6 -2/3 X 2/2 +7/6 24/6 -4/6 +7/6 27/6
Suite de la D
21/6 X 6/27 = 126/162 = 14 /18 = 7/9
