Réponse :
Explications étape par étape
Bonjour
A = 2/3 - 7/3 x 8/35
A = 2/3 - 7/35 x 8/3
A = 2/3 - 7/(7 x 5) x 8/3
A = 2/3 - 1/5 x 8/3
A = 2/3 - 8/15
A = (2 x 5)/(3 x 5) - 8/15
A = 10/15 - 8/15
A = 2/15
B = (3/4 - 5/6) x 3/4
B = [(3 x 3)/(4 x 3) - (5 x 2)/(6 x 2)] x 3/4
B = (9/12 - 10/12) x 3/4
B = -1/12 x 3/4
B = -3/12 x 1/4
B = -1/4 x 1/4
B = -1/16
C = 22 : (2/3 - 5/2)
C = 22 : (4/6 - 15/6)
C = 22 : (-11/6)
C = 22 x -6/11
C = 22/11 x -6
C = 2 x -6
C = -12
