( 3/4 - 5/6) diviser ( 1 + 7/3) ( sous forme de fraction irreductible)

(3/4 - 5/6) : (1 + 7/3)
= (18/24 - 20/24) : (3/3 + 7/3)
= - 2/24 : 10/3
= - 1/12 x 3/10
= - 3/120
= - 1/40