Réponse :
Explications étape par étape :
Bonsoir
B= 2 - 13/7 + (1+5/2)
B= 2 - 13/7 +(2/2 + 5/2)
B = 2 - 13/7 +7/2
B = 28/14 - 26/14 + 49/14
B = 51 / 14
E = (1/3 + 1/2 - 1/7) / ( 2/3 - 4/7 + 1/6)
E = ( 14/42 + 21/42 - 6/42) / (28/42-24/42 +7/42)
E = (29/42) /(11/42)
E = (29/42) ×(42/11)
E = (29×42) /(11×42)
E= 29/11
F = (1/2 + 5/3) ×( 3 + 7/4) / (1/2 - 5/6)
F = (3/6 + 10/6) ×(12/4 + 7/4) / (3/6 -5/6)
F= 13/6 ×19/4/(-2/6)
F = 13/6 × 19/4 × 6/(-2)
F = (13 × 19 × 6) / (6×4×(-2))
F= - 247/ 8
