Olá

[tex]\LARGE{}4.5 \div 16.2 \\ \\ \LARGE{} \frac{9}{2} \div \frac{81}{5} \\ \\ \LARGE{} \frac{9}{2} \times \frac{5}{81} \\ \\ \LARGE{} \frac{\cancel{9}}{2} \times \frac{5}{\cancel{81}} \\ \\ \LARGE{} \frac{1}{2} \times \frac{5}{9} \\ \\ \LARGE\boxed{ \frac{5}{18} }[/tex]

[tex]{\large\boxed{\boxed{  { \large \tt BONS \: \: ESTUDOS \: MEU \: ANJO \:<3 }}}}[/tex]