Réponse :
bonjour
Explications étape par étape :
A= -8/9+7/4
= -32/36 +63/36
= 31/36
B=11/3 – 5/4
=44/12 – 15/12
=29/12
C=-2/3-10/7
=-14/21 – 30/21
=-44/21
A=14/15-7/20-1/6
=56/60 -21/60-10/60
=25/60
=5/12
B= -5/8 + 5/24 +5/12
=-15/24 +5/24 +10/24
=0
