Bài giải:

$\begin{align}  & \left( \frac{13}{84}\times 1\frac{2}{5}-2\frac{1}{2}\times \frac{7}{180} \right):2\frac{7}{18}+4\frac{1}{2}\times \frac{1}{10} \\  & =\left( \frac{13}{60}-\frac{7}{72} \right):\frac{43}{18}+\frac{9}{20} \\ \end{align}$

$\begin{align}  & =\frac{43}{360}:\frac{43}{18}+\frac{9}{20} \\  & =\frac{1}{20}+\frac{9}{20} \\  & =\frac{1}{2} \\ \end{align}$