Réponse :
bonjour
Explications étape par étape :
1. 3/8 x -5/4 =-15/32
2. -2/7 x 1/-5 = 2/35
3. -15/7 x -2/5 x14/6
=-15/7 x-2/5 x7/3
=6/3
=2
4. -6/5 x3/2 x10/9
=-3/3
=-1
5. (8/7) / (21/2)
=8/7 x 2/21
=16/147
6.(1/2) /(14/5)
=1/2 x 5/14
=5/28
7. (3/5) / (21/15)
=3/5 x 15/21
=3/7
