Bonsoir,
x = 5/6 ; y = - 1/24 ; z = - 7/12
A = x + y + z
A = 5/6 - 1/24 - 7/12
A = (5 x 4) / (6 x 4) - 1/24 - (7 x 2) / (12 x 2)
A = 20/24 - 1/24 - 14/24
A = 20/24 - 15/24
A = 5/24
B = x - y + z
B = 5/6 - (- 1/24) - 7/12
B = 20/24 + 1/24 - 14/24
B = 21/24 - 14/24
B = 7/24
C = x - (y + z)
C = 5/6 - (- 1/24 - 7/12)
C = 20/24 - (- 1/24 - 14/24)
C = 20/24 - (- 15/24)
C = 20/24 + 15/24
C = 35/24.
