Pouvais vous m'aider svp

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