[tex]2. V = l^{3} = 0.8^{3} = 0.512 cm^{3}\\ \\m = 200 dg = 20 g\\\\densitatea= \frac{m}{V} = \frac{20}{0.512} = 39.05 \frac{g}{cm^{3}} \\\\3.V = 200000 cm^{3}\\\\m = densitatea * V = 200000 cm^{3} * 2.5g/cm^{3} = 500 000 g[/tex]
