Bonjour
A = 1 - - 7/3
A = 1 + 7/3
A = (1 x 3) / (1 x 3) + 7/3
A = 3/3 + 7/3
A = 10/3
B= - 2/10 + 7/25
B = (- 2 x 5) / (10 x 5) + (7 x 2) / (25 x 2)
B = - 10/50 + 14/50
B = 4/50
B = (2 x 2) / (2 x 25)
B = 2/25
C = - 7/15 x (- 5/21)
C = 35/315
C = (35 x 1) / (35 x 9)
C = 1/9
D = - 7/3 + - 21/6
D = (- 7 x 2) / (3 x 2) - 21/6
D = - 14/6 - 21/6
D = - 35/6.
