Давай посчитаем этот примерчик вместе!
\[ 8 \frac{1}{2} = \frac{8 \times 2 + 1}{2} = \frac{17}{2} \)
\[ 7 \frac{3}{8} = \frac{7 \times 8 + 3}{8} = \frac{56 + 3}{8} = \frac{59}{8} \)
\[ \frac{17}{2} - \frac{59}{8} = \frac{17 \times 4}{8} - \frac{59}{8} = \frac{68}{8} - \frac{59}{8} = \frac{9}{8} \)
\[ 5 \frac{2}{3} = \frac{5 \times 3 + 2}{3} = \frac{17}{3} \)
\[ 1 \frac{4}{5} = \frac{1 \times 5 + 4}{5} = \frac{9}{5} \)
\[ \frac{9}{8} + \frac{17}{3} - \frac{9}{5} \)
\[ \frac{9 \times 15}{120} + \frac{17 \times 40}{120} - \frac{9 \times 24}{120} \)
\[ \frac{135}{120} + \frac{680}{120} - \frac{216}{120} = \frac{135 + 680 - 216}{120} = \frac{599}{120} \)
\[ \frac{599}{120} = 4 \frac{119}{120} \)
Ответ: 4 rac{119}{120}