Question

Tính nhẩm

Answer 1

6 + 3 = 9                            5 + 5 = 10                         

8 – 2 = 6                            5 – 4 = 1

1 + 8 = 9                            9 + 0 = 9                           

6 – 6 = 0                            10 – 0 = 10