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25 cm^3 = 25 cm^3
b. 8 dm^3 = 8000 cm^3 ,
bo 1dm= 10 cm, a 1 dm^3 = 10*10*10 = 1000cm^3
c. chyba powinno być: 56 kg/m^3
56 kg/m^3 = 56000g/ 0,001dm^3= 56000000 g/dm^3
bo 1kg=1000g; m^3 = 0,001 dm^3
d. 55 dm^3= 56/1000 = 0,056 m^3