Réponse :
Bonsoir
Explications étape par étape
A = (1 + 1/2 - 1/3)/(5/2 + 3/4)
A = (6/6 + 3/6 - 2/6)/(20/8 + 6/8)
A = 7/6 ÷ 26/8
A = 7/6 × 8/26
A = 7×2×2×2/3×2×2×13
A = 14/39
B = 5/2 × 3/4 × 8/1
B = 5×3×4×2/2×4×1
B = 15/1
B = 15
C = 13/21 × 42/26
C = 13×3×2×7/3×7×2×13
C = 1/1
C = 1
D = 11 - 7/2 + 5/3 × ( 2 - 1/2)
D = 66/6 - 21/6 + 10/6 × (4/2 - 1/2)
D = 55/6 × 3/2
D = 55 × 3 / 3 × 2 × 2
D = 55/4