$V=1,1\cdot {10}^3\text{cm}\cdot 3\cdot {10}^4\text{cm}\cdot 7,5\cdot {10}^2\text{cm}=1,1\cdot 3\cdot 7,5\cdot {10}^{3+4+2}{\text{cm}}^3=$  

$=3,3\cdot 7,5\cdot {10}^9{\text{cm}}^3=3\frac{3}{10}\cdot 7\frac{1}{2}\cdot {10}^9{\text{cm}}^3=\frac{33}{10}\cdot \frac{15}{2}\cdot {10}^9{\text{cm}}^3=\frac{495}{20}\cdot {10}^9{\text{cm}}^3=$  

$=\frac{2475}{100}\cdot {10}^9{\text{cm}}^3=24,75\cdot {10}^9{\text{cm}}^3=\underline{2,475\cdot {10}^{10}{\text{cm}}^3}$