Répondre :
A = 1/2-3/4x16/9
=1/2-48/36
=18/36-48/36=-30/36 ou -5/6
B = 1/5-3/10x1/6+1/2
=1/5-3/60+1/2
=12/60-3/60+30/60=39/60 ou 13/20
C = (1/5-3/10)x1/6+1/2
=(2/10-3/10)x1/6+1/2
=(-1/10)x1/6+1/2
=-1/60+1/2
=-1/60+30/60=29/60
=1/2-48/36
=18/36-48/36=-30/36 ou -5/6
B = 1/5-3/10x1/6+1/2
=1/5-3/60+1/2
=12/60-3/60+30/60=39/60 ou 13/20
C = (1/5-3/10)x1/6+1/2
=(2/10-3/10)x1/6+1/2
=(-1/10)x1/6+1/2
=-1/60+1/2
=-1/60+30/60=29/60