正确答案为:
m=3000g+5g=3005g
V水=3000g×1g/cm³=3000cm³
V酒=50g×0.8g/cm³=40cm³
V液=V水+V酒=3000cm³+40cm³=3040cm³
ρ液=V/m=3005g÷3040≈0.99g/cm³
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