bonjour
V = 3.8 - 3 /5 + 8 /15 dénominateur commun = 15
V = 57/15 - 9/15 + 8/15
V = 56/15
W = 7/15 - ( 4/5 + 5 /3 ) dénominateur commun = 15
W = 7/15 - ( 12/15 + 25/15 )
W = 7/15 - 12/15 - 25/15
W = - 30/15 = - 2
Z = ( 7/12 + 5/3 ) - ( - 4 /7 - 4 /6 )
= ( 7 /12 + 20/12 ) - ( - 24/42 - 28/42 )
= 27/12 - ( - 52/42 )
= 27/12 + 52/42
= 189/84 + 104/84 dénominateur commun = 84
= 293/84
bonne journée