2 8/10:8,4×4 8/10-1,3+5 1/6

[tex] \frac{28}{10} \div \frac{84}{10} \times \frac{48}{10} - \frac{13}{10} + \frac{31}{6} \\ \frac{14}{5} \times \frac{10}{84} \times \frac{24}{5} - \frac{13}{10} + \frac{31}{6} \\ \frac{2}{1} \times \frac{4}{5} - \frac{13}{10} + \frac{31}{6} \\ \frac{8}{5} - \frac{13}{10} + \frac{31}{6} \\ \frac{48}{30} - \frac{39}{30} + \frac{155}{30} \\ \frac{164}{30} = \frac{82}{15} [/tex]