Bonjour,
Calculer en donnant le résultat sous forme simplifiée :
5/4x7/3
= 35/12
7/15-2/15x9/4
= 7/15 - 18/20
= (7 x 4) / (15 x 4) - (18 x 3) / (20 x 3)
= 28/60 - 54/60
= - 26/60
= (2 x - 13) / (2 x 30)
= - 13/30
2x5/7-27/14.
= 10/7 - 27/14
= (10 x 2) / (7 x 2) - 27/14
= 20/14 - 27/14
= - 7/14
= (7 x - 1) / (7 x 2)
= - 1/2.
