1. 1/2 + 2/5 + 2/3 = 2. 1/2 - 2/5 = 3. 5/7 - 2/5 =

1. 47/30. 2. 1/10. 3. 11/35

1)1/2+2/5+2/3=15/30+12/30+20/30+47/30=1 17/30
2)1/2-2/5=5/10-4/10=1/10
3)5/7-2/5=25/35-14/35=11/35