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b)511 m²=5,11 ar
2
312 683km²=31268300 ha
38 200 000÷31268300=1,22 os/ha
a) 0,13cm² = 13 mm²
b) 511m² = 5,11 ar
Zad.2
a) 312 683 km² = 31268300 ha
ludność - 38,2 mln
31268300 ha: 38,2 mln = 0,81ha ( na jednego mieszkańca)