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2014-05-24T09:41:45+03:00
3000Kg/m³=3000x1000g/(100cm)³=3000000/1000000g/cm³=3g/cm³
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2014-05-24T11:47:13+03:00
3000kg=3 000 000 g 
1m³=1000dm³=1 000 000 cm³
3 000 000/1 000 000=3 g/cm³