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1kg=1000g=10^3 g
1m=100cm
1m3=100^3 cm3 = 10^6 cm3
g=810*(10^3/10^6) g/cm3 = 810*0,001 g/cm3 = 0,81 g/cm3
810×1000/100=8100g/cm³
zera sie skracają. w 1000 i 100