Bonsoir les amis jais un ex de math a faire et je bloque se serai possible de maider merci a vous

Bonsoir,
B = 2/3 - 4/3 Ă— 5/2
B = 2/3 - (4Ă—5)/(3Ă—2)
B = 2/3 - 20/6
B = 4/6 - 20/6
B = -16/6 = -8/3
C = 5 + (1 + 1/8) Ă· 3/4
C = 5 + 9/8 Ă· 3/4
C = 5 + 9/8 Ă— 4/3
C = 5 + (9Ă—4)/(8Ă—3)
C = 5 + 36/24
C = 120/24 + 36/24
C = 156/24 = 13/2
Bonne soirée !
Réponse :
Bonsoir,
B = 2/3 - 4/3 * 5/2
B = 2/3 - (4*5/3*2)
B = 2/3 - 20/6
B = (2*2/2*3) - 20/6
B = 4/6 - 20/6
B = -16/6
B = -(2*8)/(2*3)
B = -8/3
C = 5 + (1 + 1/8)/(3/4)
C = 5 + (8*1/8*1 + 1/8)/(3/4)
C = 5 + (8/8 + 1/8)/(3/4)
C = 5 + (9/8)/(3/4)
C = 5 + (9/8)*(4/3)
C = 5 + (9*4)/(8*3)
C = 5 + 36/24
C = 5 + (12*3)/(12*2)
C = 5 + 3/2
C = (2*5)/(2*1) + 3/2
C = 10/2 + 3/2
C = 13/2