Bonjour
A= 3/10 + -5/5
A = 3/10 - (5 x 2) / (5 x 2)
A = 3/10 - 10/10
A = - 7/10
B= 28/36 - 9/4
B = 28/36 - (9 x 9) / (4 x 9)
B = 28/36 - 81/36
B = - 53/36
C= -5/21 + 3/7
C = - 5/21 + (3 x 3) / (7 x 3)
C = - 5/21 + 9/21
C = 4/21
D= 11/12 - 5/4
D = 11/12 - (5 x 3) / (4 x 3)
D = 11/12 - 15/12
D = - 4/12
D = (4 x - 1) / (4 x 3)
D = - 1/3
E= -7/10 + 3/4
E = (- 7 x 2) / (10 x 2) + (3 x 5) / (4 x 5)
E = - 14/20 + 15/20
E = 1/20.
