Bonjour,
A = 1/3 × -4/5 = 1 × -4/3 × 5 = -4/15
B = 2,2/5 × -3/5 = 11/25 × -3/5 = 11 × -3/25 × 5 = -33/125
C = -10/3 × -5/7 = -10 × -5/3 × 7 = 50/21
D = -8/3 × 3/4 × 5/7 = -24/12 × 5/7 = -120/84 = -10/7
E = 2/15 × -13/7 = -26/105
F = 1,2 × 3/25 = 12/10 × 3/25 = 36/250 = 18/125
G = 7/8 × (-3) × 5/4 = 7/8 × -3/1 × 5/4 = -105/32
H = 2/3 × -3/2 × 1/2 = -6/12 = -1/2
En esperant t'avoir aidé(e) ! ^^