依据ρ=m/v=m1-m2/v1-v2=72.6-67/22-15=0.8g/cm^3
答:密度为0.8g/cm^3
依据ρ=m1/v1-m1=ρv1=0.8g/cm^3×15cm^3=12g m杯=m总-m1=67g-12g=55g
答:质量为55g
依据ρ=m/v=m1-m2/v1-v2=72.6-67/22-15=0.8g/cm^3
答:密度为0.8g/cm^3
依据ρ=m1/v1-m1=ρv1=0.8g/cm^3×15cm^3=12g m杯=m总-m1=67g-12g=55g
答:质量为55g