решите пример дроби 1 1/7-5 1/21:6 2/35*0,9-0,25

[tex} \frac{11}{7}-5 \frac{1}{21}:6 \frac{2}{35}*0,9-0,25 \\ \frac{11*3}{7*3}- \frac{106}{21}* \frac{35}{212}* \frac{18}{20}- \frac{5}{20} \\ \frac{33-106}{21} * \frac{35}{212} * \frac{18}{20}- \frac{5}{20} \\ [/tex]

Кажется, что-то пошло не так.

\\ \frac{11*3}{7*3}- \frac{106}{21}* \frac{35}{212}* \frac{18}{20}- \frac{5}{20} \\ \frac{33-106}{21} * \frac{35}{212} * \frac{18}{20}- \frac{5}{20} \\ [/tex] - \frac{73}{21}* \frac{35}{212}* \frac{18}{20}- \frac{5}{20} \\ - \frac{365}{636} * \frac{18}{20} - \frac{5}{20} \\ -\frac{219}{424} - \frac{5}{20} = \frac{113}{424} [/tex]