Ex 3 va rog mult
Dau coroana!

a.5/8+2/8-3/8=7/8-3/8=4/8
b.7/18-2/18+4/18=5/18+4/18=9/18
c.40/24-4/24=36/24
d.17/35+18/35=35/35=1
e.30/20-10/20=20/20=1