\( \Large \frac{13}{63} \div \frac{104}{14} \times \frac{52}{19} = ? \)

\( \Large = ? = \frac{\frac{13}{63}}{\frac{104}{14}} \times \frac{52}{19} = \frac{13 \times 14}{63 \times 104} \times \frac{52}{19} \)

\( \Large \frac{13 \times 7 \times 52}{63 \times 52 \times 19} \)

\( \Large = \frac{13 \times 7}{63 \times 19} = \frac{13}{9 \times 19} = \frac{13}{171} \)

\( \Large ? = \frac{13}{171} \)