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290a = 2,9ha
12 ha = 12 000 000dm²
2700 m² = 27 ar
zamień na ha - 290 a
290 ar = 2,9 ha
zamień na dm kwadratowe - 12 ha
12 ha = 12000000 dm²
2. 290a=2,9ha
3. 12ha=12000000dm²