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Ce fractie dintr-o ora reprezinta 15 minute? Dar 30 de minute?

Răspuns :

15\60=5\12ore
30\60=15\30=5\6 ore
1h=60 min
15 min=1/4h
30 min=1/2h
notam x-fractia
x*60=15
x=15/60=>x=1/4
x*60=30
x=30/60=>x=1/2