Question

Tính:     

Answer 1

                        4 + 7 = 11                       

11 – 8 = 3                               5 + 9 = 14

7 + 9 = 16                              13 – 8 = 5

12 – 8 = 4                              7 + 5 = 12

5 + 6 = 11                              15 – 9 = 6

14 – 7 = 7                              4 + 8 = 12

6 + 8 = 14                             12 – 4 = 8