Bài giải:

$\frac{\left(\frac{3}{15}+\frac{1}{4}+\frac{7}{20}\right)\times \frac{17}{49}}{5\frac{1}{3}+\frac{2}{5}}=\frac{\left(\frac{12}{60}+\frac{15}{60}+\frac{21}{60}\right)\times \frac{17}{49}}{\frac{16}{3}+\frac{2}{5}}=\frac{\frac{48}{60}\times \frac{17}{49}}{\frac{80}{15}+\frac{6}{15}}=\frac{68}{245}:\frac{86}{15}=\frac{68}{245}\times \frac{15}{86}=\frac{102}{2107}$