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2,21km2= 2.21*10^6 m2= 546.1a
3,4ha= 340a= 34*10^3 m2
3,4l= m2(tutaj nie powinno byc m^3? jeśli tak to 0.0034)= 3400ml
8,4 dm3= 8400 ml= 0.0084 m3
145cm2= 1,45dm2= 0.0145m2