Bonjour,
A= 7/3 - 15/12
= 7/3 - 5/3
= 2/3
C = 4/3 -7/3 ( 2/2-3/2)
= 4/3 -7/3 ( -1/2)
=4/3 +7/6
= 8/6 - 7/6
=1/6
B= (9/12 - 20/12) / -7/12
=-11/12 * -12/7
= 11/7
D= 9/64 -1/8
= 9/64 - 8/64
= 1/64
E=
3/5 -1/4 = 12/20 - 5/20 = 7/20
1+2/5 = 5/5 +2/5 = 7/5
(7/20) / (7/5)
=7/20 * 5/7 = 35/ 140
= 7/ 28
= 1/4
