[填空题]
A student is measuring the densn acc0h*92qp qityuxkp-u, w(at6-nu.g7. /t:mi gokybu of a solution. He recorded the data in the follow.,k:gbg-uoyt(uw6u/k - ia mn.xt7uping 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.
$\pm$ %
