1 = 2 : 2

2 = 2

3 = 2 x 2 - 2 : 2

4 = 2 x 2

5 = 2 x 2 + 2 : 2

6 = 22 + 2

7 = 22 + 2 : 2 - 2 : 2

8 = 22 + 2 : 2

9 = ( 2 + 2 : 2 ) ( 2- 2 : 2 )

10 = 2 + 2 + 2 + 2 + 2