2 + 5 = 7                           6 + 2 = 8                           

10 – 3 = 7                          8 – 5 = 3

3 + 6 = 9                            3 + 7 = 10                         

9 – 4 = 5                             7 – 2 = 5

3 + 1 + 6 = 4 + 6 = 10                                                            

8 – 4 – 3 = 4 – 3 = 1

9 – 1 – 3 = 8 – 3 = 5                                                               

3 + 4 + 2 = 7 + 2 = 9

4 + 4 = 8                            8 + 0 = 8                           

0 + 8 = 8                            7 + 1 = 8

1 + 7 = 8                            3 + 5 = 8                           

5 + 3 = 8                            6 + 2 = 8         

2 + 6 = 8

2 + 2 = 4                            6 + 2 =8                            

4 + 0 = 4                            10 – 7 = 3

3 + 3 = 6                             2 + 6 = 8                           

0 + 6 = 6                            10 – 9 = 1

4 + 4 = 8                            8 – 2 = 6                           

8 – 0 = 8                            6 + 3 = 9

5 + 5 = 10                          8 – 6 = 2                           

9 – 9 = 0                            9 – 4 = 5

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nx hả e:))

a)

b)

4 – 1 – 1 = 3 – 1 = 2                                                             

7 – 1 – 2 = 6 – 2 = 4