Bonsoir,
A=3/4 - 1/2 x 1/2
= 3/4 -1/4
= 2/4
= 1/2
B=(2/7 + 1/14) x 3/2
= (4/14 + 1/14) * 3/2
= 5/14 * 3/2
= 15/28
Réponse:
A = 2/4 soit 1/2
B = 15/28
Explications étape par étape:
A = 3/4 - 1/2 × 1/2
= 3/4 - (1×1)/(2×2)
= 3/4 - 1/4
= (3-1)/4
= 2/4
B = (2/7 + 1/14) × 3/2
= ( (2×2/7×2) + 1/14) × 3/2
= (4/14 + 1/14) × 3/2
= (4+1/14) × 3/2
= 5/14 × 3/2
= (5×3)/(14×2)
= 15/28