Bonjour,

(1/3 - 2/3 x 15/8 + 7/12) / (1/5 - 7/2)

= [(1 x 8) / (3 x 8) - 30/24 + (7 x 2) / (12 x 2)] / [(1 x 2) / (5 x 2) - (7 x 5) / (2 x 5)]

= (8/24 - 30/24 + 14/24) / (2/10 - 35/10)

= - 8/24 : - 33/10

= - 8/24 x - 10/33

= 80/792

= (8 x 10) / (8 x 99)

= 10/99.

Bonjour,

A=(1/3-2/3*15/8+7/13):(1/5-7/2)

A=-1/3:(-33/10)

A=1/3*10/33

A=10/99