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Král tvrdí, že cihlička o rozměrech 2 cm x 3 cm x 5 cm je vyrobena z ryzího zlata. Cihlička váží 570 g. Je skutečně vyrobena ze zlata? (hustotu zlata bereme jako 19 g/cm3)
Ze železa o hustotě 7,8 g/cm3 jsme vyrobili krychličku o straně 1 cm. Jaká bude její hmotnost?
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