\[\frac{17}{5} + \frac{3}{4} = \frac{17 \cdot 4}{5 \cdot 4} + \frac{3 \cdot 5}{4 \cdot 5} = \frac{68}{20} + \frac{15}{20} = \frac{68+15}{20} = \frac{83}{20}\]
\[\frac{40}{5} + \frac{5}{200} = \frac{40 \cdot 40}{5 \cdot 40} + \frac{5}{200} = \frac{1600}{200} + \frac{5}{200} = \frac{1600+5}{200} = \frac{1605}{200}\]
\[\frac{1: \frac{83}{20}}{\frac{1605}{200}} \cdot \frac{4}{4}\]
\[1 : \frac{83}{20} = 1 \cdot \frac{20}{83} = \frac{20}{83}\]
\[\frac{\frac{20}{83}}{\frac{1605}{200}} \cdot \frac{4}{4}\]
\[\frac{20}{83} : \frac{1605}{200} = \frac{20}{83} \cdot \frac{200}{1605} = \frac{20 \cdot 200}{83 \cdot 1605} = \frac{4000}{133215}\]
\[\frac{4000}{133215} \cdot \frac{4}{4}\]
\[\frac{4000}{133215} \cdot \frac{4}{4} = \frac{4000 \cdot 4}{133215 \cdot 4} = \frac{16000}{532860}\]
\[\frac{16000}{532860} = \frac{1600}{53286} = \frac{800}{26643}\]
\[\frac{123}{30} - \frac{5}{6} - \frac{1}{3} = \frac{123}{30} - \frac{5 \cdot 5}{6 \cdot 5} - \frac{1 \cdot 10}{3 \cdot 10} = \frac{123}{30} - \frac{25}{30} - \frac{10}{30} = \frac{123 - 25 - 10}{30} = \frac{88}{30} = \frac{44}{15}\]
\[4 \frac{3}{4} + 7 \frac{1}{2} = \frac{4 \cdot 4 + 3}{4} + \frac{7 \cdot 2 + 1}{2} = \frac{19}{4} + \frac{15}{2} = \frac{19}{4} + \frac{15 \cdot 2}{2 \cdot 2} = \frac{19}{4} + \frac{30}{4} = \frac{19 + 30}{4} = \frac{49}{4}\]
\[\frac{\frac{44}{15}}{\frac{49}{4}} - \frac{5}{4}\]
\[\frac{44}{15} : \frac{49}{4} = \frac{44}{15} \cdot \frac{4}{49} = \frac{44 \cdot 4}{15 \cdot 49} = \frac{176}{735}\]
\[\frac{176}{735} - \frac{5}{4} = \frac{176 \cdot 4}{735 \cdot 4} - \frac{5 \cdot 735}{4 \cdot 735} = \frac{704}{2940} - \frac{3675}{2940} = \frac{704 - 3675}{2940} = \frac{-2971}{2940}\]
\[\frac{\frac{800}{26643}}{\frac{-2971}{2940}}\]
\[\frac{800}{26643} : \frac{-2971}{2940} = \frac{800}{26643} \cdot \frac{2940}{-2971} = \frac{800 \cdot 2940}{26643 \cdot -2971} = \frac{2352000}{-79157353}\]
\[\frac{2352000}{-79157353}\]
Ответ: \(\frac{2352000}{-79157353}\)