125cm^3=0.000125m^3m=600kg/m^3×0.000125m^3=0.075kgG物=mg=0.075kg×10N/kg=0.75N漂浮：F浮=G物=0.75N V排= （0.000125m^3）/2=0.0000625m^3F浮=盐水密度×g×V排=0.75N 盐水密度=1200kg/m^3
65855+85998
