Bonjour,
A = 5 x 2/3 - 1/3
A = 10/3 - 1/3
A = 9/3
A = (3 x 3) / (3 x 1)
A = 3
B = 7/4 - 3/4 x 3/2
B = 7/4 - 9/8
B = (7 x 2) / (4 x 2) - 9/8
C = 14/8 - 9/8
C = 5/8
C = (5/6 + 7/12) x 3/5
C = [(5 x 2) / (6 x 2) + 7/12] x 3/5
C = (1012 + 7/12) x 3/5
C = 17/12 x 3/5
C = 51/60
C = (3 x 17) / (3 x 20)
C = 17/20
D = 3/4 x 2/9 + 28/15 x 25/14
D = 6/36 + 700/210
D = (6 x 1) / (6 x 6) + (70 x 10) / (70 x 3)
D = 1/6 + 10/3
D = 1/6 + (10 x 2) / (3 x 2)
D = 1/6 + 2/6
D = 3/6
D = (3 x 1) / (3 x 2)
D = 1/2.
