Question

Proba adunarii:47+31=78,21+7=28,14+23=37,80+20=100,12+8=20,12+40=52,51+10=61,42+37=79

Answer 1

47+31=78
Proba:
78-31=47
sau:
78-47=31

21+7=28
Proba:
28-7=21
sau:
28-21=7

14+23=37
Proba:
37-23=14
sau:
27-14=23

80+20=100
Proba:
100-20=80
sau:
100-80=20

12+8=20
Proba:
20-8=12
sau:
20-12=8

12+40=52
Proba:
52-12=40
sau:
52-40=12

51+10=61
Proba:
61-10=51
sau:
61-51=10

42+37=79
Proba:
79-37=42
sau:
79-42=37.

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