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1ha=100m*100m=10000m²
1a=10m*10m=100m²
1km²=1000m*1000m=1000000m²
zamieniamy teraz wynik:
490000m²==49*10000m²=49ha
490000m²=4900*100m²=4900a
490000m²=490000:1000000m²=0,49km²
odp.A