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Układamy proporcję:
9m/a = 162m²/648m²
162a m² = 648m² * 9m
162a m² = 5832m³ / : 162m²
a = 36m
18m/b = 162m²/648m²
162b m² = 648m² * 18m
162b m² = 11664 m³ / : 162m²
b = 72m
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