Réponse :
Explications étape par étape
Bonsoir
A = (2/3 - 1/3) / (3/4 + 2/3)
A = 1/3 / [(3 x 3)/(4 x 3) + (2 x 4)/(3 x 4)]
A = 1/3 / (9/12 + 8/12)
A = 1/3 / (17/12)
A = 1/3 x 12/17
A = (3 x 4)/(3 x 17)
A = 4/17
B = 2 + (2/7)/(5/14)
B = 2 + 2/7 x 14/5
B = 2 + 14/7 x 2/5
B = 2 + (2 x 7)/7 x 2/5
B = 2 + 2/7 x 2/5
B = (2 x 35)/35 + 4/35
B = 70/35 + 4/35
B = 74/35
C = -3/14 - 3/(7/5) + 2
C = -3/14 - 3 x 5/7 + 2
C = -3/14 - 15/7 + 2
C = -3/14 - 30/14 + 28/14
C = -5/14
D = 7/5 + (8/15)/(2/3) - 19/2
D = 7/5 + 8/15 x 3/2 - 19/2
D = 7/5 + 8/2 x 3/15 - 19/2
D = 7/5 + (2 x 4)/2 x 3/(3 x 5) - 19/2
D = 7/5 + 4 x 1/5 - 19/2
D = (7 x 2)/(5 x 2) + (4 x 2)/(5 x 2) - (19 x 5)/(5 x 2)
D = 14/10 + 8/10 - 95/10
D = -73/10
