Réponses

2014-09-20T13:46:31+02:00

A = (3/5 - 1/3) x 21/8 - 13/20

A = (9/15 - 5/15) x 21/8 - 13/20

A = 4/15 x 21/8 - 13/20

A = 7/10 - 13/20

A = 14/20 - 13/20

A = 1/20