Question

Tính:

Answer 1

5 + 2 = 7                     

8 – 3 = 5                     

70 + 10 = 80

15 + 2 = 17                 

18 – 3 = 15                 

80 – 10 = 70

65 + 2 = 67                 

48 – 3 = 45                 

80 – 70 = 10