Bài giải:

$\begin{align}  & \frac{\left( 1\frac{9}{100}-\frac{29}{100} \right)\times 1\frac{1}{4}}{\left( 18\frac{9}{10}-16\frac{13}{20} \right)\times \frac{8}{9}}+\frac{\left( 11\frac{81}{100}+8\frac{19}{100} \right)\times \frac{1}{50}}{9:11\frac{1}{4}} \\  & =\frac{\frac{4}{5}\times \frac{5}{4}}{\frac{9}{4}\times \frac{8}{9}}+\frac{20\times \frac{1}{50}}{\frac{4}{5}} \\ \end{align}$

$\begin{align}  & =\frac{1}{2}+\frac{1}{2} \\  & =1 \\ \end{align}$