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efectueaza proba inmultirilor urmatoatr prin impartire:6x3=18 9x4=36 8x5=40 4x7=28.

Răspuns :

6x3=18
18:3=6
18:6=3

9x4=36
36:4=9
36:9=4

8x5=40
40:5=8
40:8=5

4x7=28
28:4=7
28:7=4