Réponse:
FRACTIONS
A = 2/3 - 4/15 = 10/15 - 4/15 = 6/15 = 2/5
B = -2/3 × (2/4 - 1/4) = -2/3 × 1/4 = -2/12 = -1/6
C = (-12/42 + 5/42) × (40/8 - 3/8)
= -7/42 × 37/8
= -1/6 × 37/8
= -37/48
D = (8/20 - 15/20) / (2 + 14/4)
= (-7/20) / (8/4 + 14/4)
= (-7/20) / (22/4)
= (-7/20) × (2/11)
= -14/220
= -7/110
