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afla prin saderea repetata
30 il cuprinde pe 5 6 10
3 se cuprinde in 9 12 15


Răspuns :

30÷5=6

30-5-5-5-5-5-5

30÷6=5
30-6-6-6-6-6

30÷10=3
30-10-10-10

9÷3=3
9-3-3-3

12÷3=4
12-3-3-3-3

15÷3=5
15-3-3-3-3-3