bonjour,
A = 20/16 - 3 /16 = 17/16
B = 15/15 - 17/15 = - 2/15
C = - 13/80 - 230/16
= - 13/80 - 1150/80
= - 1 163/80
D = - 4/15
E = ( 2/4 - 3/4) x 16/9
= - 1/4 x 16/9
= - 16/ 36
= - 4 /9
H = 1 x - 20 /19 = - 20/19
