Besoin pour l'exercice 104 svp

Exercice - 104 :

E = -3/4 + 7/4 x 2/3
= -3/4 + 14/12
= -9/12 + 14/12
= 5/12

F = ( 3/2 - 5/3 ) : 5/4
= ( 9/6 - 10/6 ) : 5/4
= -1/6 : 5/4
= -1/6 x 4/5
= -4/30
= -2/15