exercice un s'il vous plaît exercice 1 calculer

A=3/5-2/5x1/3
=3/5-2/15
=9/15-2/15
=7/15

B=14/3x(2/7-3/14)
=14/3x(4/14-3/14)
=14/3x1/14
=196/42-3/42
=193/42

C=3/2+5/6x8/10
=3/2+40/60
=90/60+40/60
130/60
=13/6