pouvez vous m'aider svp ? merci beaucoup ​exercice 71

Réponse :

Bonsoir

Explications étape par étape

A = 24/18 × 5- 1/2 × 20/3

A = 24 × 5/18 - 1 × 20/2 × 3

A = 3×2×2×2×5/3×3×2 - 1×2×10/2×3

A = 20/3 - 10/3

A = 10/3

B = 7 - 1/15 × 5

B = 7 - 5/15

B = 7 - 1/3

B = 21/3 - 1/3

B = 20/3

C = 3/21 × (13/5 - 18/15) × 3/2

C = 3/21 × ( 39/15 - 18/15) × 3/2

C = 3/21 × 21/15 × 3/2

C = 3×21×3/21×15×2

C = 3×21×3/21×5×3×2

C = 3/10