Bonjour,
a) - 8/25 : 56/- 5
= - 8/25 x - 5/56
= 40/1400
= 40 x 1 / 40 x 35
= 1/35
b) - 72/- 55 : 6/- 121
= 72/55 x - 21/6
= - 1512/330
= 6 x - 252 / 6 x 55
= - 252/55
c) 12/- 50 : 8/- 5
= - 12/50 x - 5/8
= 96/400
= 16 x 6 / 16 x 25
= 6/25
d) 6/- 7 : - 2/243
= - 6/7 x - 243/2
= 1458/14
= 2 x 729 / 2 x 7
= 729/7
e) - 25/- 4 : - 27/- 16
= 25/4 x 16/27
= 400/108
= 4 x 100 / 4 x 27
= 100/27
f) 5/24 : 35/- 3
= 5/24 x - 3/35
= - 15/840
= 15 x - 1 / 15 x 56
= - 1/56
