体积是1dm^3的煤油质量是800g煤油的密度是____kg/m^3.若将它倒去一半则剩下一半煤油的密度是_____kg/m^37.9*10^3kg/m^3=______g/cm^3

体积是1dm^3的煤油质量是800g煤油的密度是____kg/m^3.若将它倒去一半则剩下一半煤油的密度是_____kg/m^3
7.9*10^3kg/m^3=______g/cm^3

体积是1dm^3的煤油质量是800g煤油的密度是0.8*10^3kg/m^3.若将它倒去一半则剩下一半煤油的密度是0.8*10^3kg/m^3kg/m^3
7.9*10^3kg/m^3=7.9g/cm^3