Réponse :
Explications étape par étape :
Bonsoir
B=(2-2/3):(4/5-2/3)
B = (6/3 - 2/3)/(12/15 -10/15)
B = (4/3) / (2/15)
B = 4/3 × 15/2
B = (4×15)/(3×2)
B = (2×2×3×5)/(3×2)
B = 10
