Ответ:

[tex](\frac{8}{7} -\frac{5}{6})* \frac{4}{5} =[/tex][tex]\frac{26}{105}[/tex]

[tex]1)\frac{8}{7} -\frac{5}{6} =\frac{48}{42} -\frac{35}{42}=\frac{13}{42}[/tex]

[tex]2)\frac{13}{42}*\frac{4}{5} =\frac{13*4}{42*5} =\frac{13*2}{21*5}=\frac{26}{105}[/tex]