Bonjour
calcule :
(12/3 - 4/5 x 7/3) : 8/15
= (12/3 - 28/15) x 15/8
= [(12 x 5)/(3 x 5) - 28/15] x 15/8
= (60/15 - 28/15) x 15/8
= 32/15 x 15/8
= 15/15 x 32/8
= (8 x 4)/8
= 4