1. 12 +

35 +

1214 =

13770

2. 2 + 32 �

12 = 3

3. 47 +

114 �

321 =

12

4. 15 +

27 +

57 =

65

5. 1718 +

118 + 1�

13 =

53

6. 25 �

310 �

256 +

12 = 1

7. 25 �

108 +

310 �

206 =

32

8. 12 +

23 +

34 +

44 =

3512

9. 26 �

49 �

612 �

815 �

1018 � 3 =

16243

10. 23 �

32 +

45 �

54

11. 72=

144 +

125 =

610 = 5

12. 92=

23 +

12 =

294

13. 15 �

52=

110 = 5

14. 3015=

203 +

15 :

12

15. 43=

62 �

34 =

13

1