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m=masa
v= objetośc
d=m/v
v=20 l=20dm³
m=13,6kg
d=13,6kg/20dm³=0,68kg /dm³
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1m³=1000dm³ 1dm³=0,001m³ v=20dm³=0,02m³
d=13,6kg/0,02m³=680km/m³
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1kg=1000g 13,6kg=13600g
1dm³=1000cm³ 20dm³=20 000cm³
d=13600g/20 000cm³=0,68g/cm³