ρ=m/v=m/(v_в+v_с )=m/(0.6m/ρ_в +0.4m/ρ_c )=ρ_в*ρ_c/(0.6ρ_c+0.4ρ_в )=904кг/м^3
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ρ=m/v=m/(v_в+v_с )=m/(0.6m/ρ_в +0.4m/ρ_c )=ρ_в*ρ_c/(0.6ρ_c+0.4ρ_в )=904кг/м^3