Bonjour
Calculer sous forme fractionnaire
A=4 (-21/24) - 3/2 (1/4 +8) - 1
A = - 87/24 - 3/8 - 24/2 - 1
A = 84/24 - (3 x 3) / (8 x 3) - (24 x 12) / (2 x 12) - (1 x 24) / (1 x 24)
A = 84/24 - 9/24 - 288/24 - 24/24
A = 84/24 - 321/24
A = - 237/24.
A = (3 x 79) / (3 x 8)
A = 79/8.
