6 13. 3 5 5 2 2 + 1 = + 6 = 4 8 6 3 7. 14. 2 5 2 3 4 + = 1 + - = 9 3 6 3 4 8. 15. 1 5 5 -2 = 1 ÷ = 6 2 6 25