Bonjour
Calculer A= - 1 + x - y pour:
a. x = 2/3 et y = -3/4
A = - 1 + 2/3 - (- 3/4)
A = (1 x 12) / (1 x 12) + (2 x 4) / (3 x 4) + (3 x 3) / (4 x 3)
A = 12/12 + 8/12 + 9/12
A = 12/12 + 17/12
A = 29/12
b. x = -1/4 et y = 5/6
A = 1 - 1/4 - 5/6
A = (1 x 12) / (1 x 12) - [(1 x 3) / (4 x 3) - (5 x 2) / (6 x 2)]
A = 12/12 - (3/12 - 10/12)
A = 12/12 - 13/12
A = - 1/12.
