Question

Buna am facut bine??

Answer 1

a      b    a+b        a-b            a+b+1         a-b-1            a-b+4

5----4------9..............1................9+1=10...........1-1=0.............1+4=5

3......2.........5..............1................5+1=6.............1-1=0............1+4=5

4.......0.........4..............4...............4+1=5..............4-1=3...........4+4=8

7........2........9...............5...............9+1=10...........5-1=4...........5+4=9