1- 90÷10=9
2-9×2= 18
3-6:2=3
4-3×8=24
5-31×0=0
6-18+24=42
7-42-0=42
а) 2,4,6,8,10,12
б) 5,10,15,20,25,30
в) 10,20,30,40,50,60
г) 10,20,30,40,50,6