Bonsoir,
A= -4/15 +7/2
= -8/30 + 105/30
= 97/30
B=
13/7 - 8/7 = 5/7
5/7-4 /5
= 25/3 - 28/35
= -3/35
C=
(15/10 + 6/10) ( 15/12 - 16/12)
= 21/10 *( -1/12)
= -21/ 120 = -7/40
D=
-3/8 -35/72
= -27/72 -35/72
=- 62/72 = -31/36
Excuse-moi, j'avais oublié des signes négatifs.
