Bonjour,
A = 4/11 + 3/11
A = 7/11
B = 1/6 + 5/3
B = 1/6 + 10/6
B = 11/6
C = 1/4 - 3/28
C = (1 x 7)/(4 x 7) - 3/28
C = 7/28 - 3/28
C = 4/28
C = (4 x 1)/(4 x 7)
C = 1/7
D = -19/14 + (1/7 + 2)
D = -19/14 + (1/7 + 2/1)
D = -19/14 + (1/7 + 14/7)
D = -19/14 + 15/7
D = -19/14 + 30/14
D = 11/14
