Bonsoir,
Je ne suis pas sûre de t'avoir bien lu(e) ...
A = 1/2 x (3/4 - 1/3)
A = 1/2 x [(3 x 3) / (4 x 3) - (1 x 4) / (3 x 4)]
A = 1/2 x (9/12 - 4/12)
A = 1/2 x 5/12
A = 5/60
A = (5 x 1) / (5 x 12)
A = 1/12.
B = (2 - 1/6) x 5
B = [(2 x 6) / (1 x 6) - 1/6] x 5
B = (12/6 - 1/6) x 5
B = 11/6 x 5
B = 55/6
C = 1/4 - 5/2 x - 4/5
C = 1/4 + 20/10
C = 1/4 + (10 x 2) / (10 x 1)
C = 1/4 + 2
C = (1/4 + (2 x 4) / (1 x 4)
C = 1/4 + 8/4
C = 9/4.
