Réponse :
bonjour
A = 5/6 + 3/4 - 2
A = 10/12 + 9/12 - 24/12
A = - 5/12
B = 5/14 x 21/15
B = 1/2 x 3 /3
B = 3/6 = 1/2
C = 2/5 - 12/15 x 3 /8
C = 2/5 - 3/5 x 1/2
C = 2/5 - 3/10
C = 4/10 - 3 /10
C = 1/10
D = ( 2/5 - 12/15 ) x 3 /8
D = ( 6/15 - 12/15 ) x 3 /8
D = - 6/15 x 3/8
D = - 18/ 120 = - 3/20
Explications étape par étape
