Réponse :
Explications étape par étape :
Bonsoir
a.7/12 -5/6 × 1/2 =7/12 - 5/12 = 2/12 = 1/6
b.7/4÷2-1/6×2/3 = 7/4 × 1/2 - (1×2)/(6×3) = 7/8 - (1×2) / (2×3×3)= 7/8 -1/9 = 63/72 - 8/72 = 55/72
c.3.7/12÷(5/6+1/2)= 37/120 / (5/6 +3/6) = 37/120 / (8/9) = 37/120 × 9/8 = (37×9)/(120×8) = (37×3×3) / (3×40×8) = 111/320
d.(3/5)^2-(-5)/6 = 9/25 + 5/6 = 54/150 + 125/150 = 179/150
