[tex] \frac{1}{4} \div \frac{80}{3} \div \frac{1}{8} \div \frac{5}{4} = \frac{1}{4} \times \frac{3}{80} \times \frac{8}{1} \times \frac{4}{5} = \frac{1}{4} \times \frac{4}{5} \times \frac{3}{80} \times \frac{8}{1} = \frac{1}{1} \times \frac{1}{5} \times \frac{3}{10} \times \frac{1}{1} = \frac{1}{5} \times \frac{3}{10} = \frac{3}{50} [/tex]

ответ: 3/50