[填空题]
A student is measuring the density ooz6 t ircq,1tx he. ;;tfbuwga(1s9)rf a solution. He recordel,bl)/ e3e veyztz7 (cd the data in the folll(/b)cee3 zvly zt ,7eowing table.
1.Write the expression of the average density of the solution in a fraction form (make sure to include the absolute uncertainties for each physical quantity).
2.Calculate its corresponding uncertainty. Show your work clearly.
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