Question

Tính nhẩm:

Answer 1

a)

8 + 1 = 9                 6 + 0 = 6                                 

10 – 5 = 5                5 – 0 = 5

3 + 3 = 6                  7 + 3 = 10                               

8 – 3 = 5                  4 – 4 = 0

Answer 2

b)

7 + 2 + 1 = 10                                                        

10 – 3 – 2 = 5

5 – 1 – 2 = 2                                                           

4 + 2 – 5 = 2