afla prin scaderea repetata de cite ori 30 il cuprinde pe5 pe6 pe10

Răspuns :

30-5-5-5-5-5-5 (de 6 ori)
30-6-6-6-6-6(de 5 ori )
30-10-10-10 ( de 3 ori)
30 - 5-5-5-5-5-5=0
30- 6-6-6-6-6=0
30-10 -10 -10 =0