Bonjour ,
C = 11/24 - 5/6 × 5/4
C = 11/24 - 25/24
C = -14/24
C = -7/12 .
A = -7/5 + -3/5
A = -10/5
A = -2
E = 1 + 1/2 × 5 - 3/4
E = 1 + 5/2 - 3/4
E = 4/4 + 10/4 - 3/4
E = 11/4 .
B = 13/-6 + -5/6
B = -13/6 + -5/6
B = -18/6
B = -3 .
** Je te laisse faire les plus faciles !!