Bonjour
a. Pour x = 2/3 et y = - 3/4
A = - 1 + x - y
A = - 1 + 2/3 - (- 3/4)
A = (- 1 * 12) / (1 * 12) + (2 * 4) / (3 * 4) - (- 3 * 3) / (4 * 3)
A = - 12/12 + 8/12 + 9/12
A = - 12/12 + 17/12
A = 5/12
b. Pour x = - 1/4 et y = 5/6
A = - 1 + x - y
A = - 1 - 1/4 - 5/6
A = (- 1 * 12) / (1 * 12) - (1 * 3) / (4 * 3) - (5 * 2) / (6 * 2)
A = - 12/12 - 3/12 - 10/12
A = - 25/12
