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1ha=10000m2
1ha na sek= 10000m2 na sek
2)
860 km2 dziennie
1km2=1 000 000 m2
860 km2=860 000 000 m2
3)
310 000 km2
1 km2= 100 ha
310 000*100=31 000 000 ha
Polska: 322 575 km2 (http://pl.wikipedia.org/wiki/Polska)