Давай разберем этот сложный пример по кусочкам!
\[ 2 \frac{3}{5} = \frac{13}{5} \)
\[ \frac{13}{5} + \frac{7}{10} = \frac{26}{10} + \frac{7}{10} = \frac{33}{10} \)
\[ \frac{33}{10} + \frac{3}{17} = \frac{33 \times 17 + 3 \times 10}{170} = \frac{561 + 30}{170} = \frac{591}{170} \)
\[ \frac{7}{23} - \frac{45}{46} = \frac{14}{46} - \frac{45}{46} = \frac{-31}{46} \)
\[ \frac{591}{170} - \left( \frac{-31}{46} \right) - \frac{69}{80} - 1 \frac{1}{3} \)
\[ \frac{591}{170} + \frac{31}{46} - \frac{69}{80} - \frac{4}{3} \)
\[ \frac{591 \times 162}{27600} + \frac{31 \times 600}{27600} - \frac{69 \times 345}{27600} - \frac{4 \times 9200}{27600} \)
\[ \frac{95742}{27600} + \frac{18600}{27600} - \frac{23805}{27600} - \frac{36800}{27600} = \frac{95742 + 18600 - 23805 - 36800}{27600} = \frac{53737}{27600} \)
\[ \frac{53737}{27600} = 1 \frac{26137}{27600} \)
Ответ: 1 rac{26137}{27600}