Bài giải:

$\begin{align}

  & \left( 4\frac{1}{5}-3\frac{1}{2} \right)\times \left( 7\frac{1}{2}-6\frac{3}{5} \right) \\

 & =\left( \frac{21}{5}-\frac{7}{2} \right)\times \left( \frac{15}{2}-\frac{33}{5} \right) \\

 & =\left( \frac{42}{10}-\frac{33}{10} \right)\times \left( \frac{75}{10}-\frac{66}{10} \right) \\

 & =\frac{7}{10}\times \frac{9}{10} \\

 & =\frac{63}{100} \\

 & =0,63 \\

\end{align}$