如题所述
ρ=m/v=1.5g/2cm三次方=0.75g/cm三次方
2.3kg=3000g
v=m/ρ=3000g/0.75g/cm三次方=4000cm三次方
3.m=ρv=6000cm三次方×0.75g/cm三次方=4500g
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