(2,75⋅\frac{3}{5}+2,2:1)⋅1\frac{1}{11} г) (\frac{39}{40}−0,575):\frac{4}{5}⋅0,8

г) Выполним действия:

$$ \frac{(2,75 \cdot \frac{3}{5} + 2,2 : 1) \cdot 1 \frac{1}{11}}{(\frac{39}{40} - 0,575) : \frac{4}{5} \cdot 0,8} = \frac{(\frac{275}{100} \cdot \frac{3}{5} + \frac{22}{10} : 1) \cdot \frac{12}{11}}{(\frac{39}{40} - \frac{575}{1000}) : \frac{4}{5} \cdot \frac{8}{10}} = \frac{(\frac{275 \cdot 3}{100 \cdot 5} + \frac{22}{10}) \cdot \frac{12}{11}}{(\frac{39}{40} - \frac{23}{40}) : \frac{4}{5} \cdot \frac{4}{5}} = \frac{(\frac{825}{500} + \frac{22}{10}) \cdot \frac{12}{11}}{(\frac{16}{40}) : \frac{16}{25}} = \frac{(\frac{33}{20} + \frac{44}{20}) \cdot \frac{12}{11}}{\frac{2}{5} : \frac{16}{25}} = \frac{\frac{77}{20} \cdot \frac{12}{11}}{\frac{2}{5} \cdot \frac{25}{16}} = \frac{\frac{77 \cdot 12}{20 \cdot 11}}{\frac{2 \cdot 25}{5 \cdot 16}} = \frac{\frac{924}{220}}{\frac{50}{80}} = \frac{4,2}{0,625} = 6,72 $$

Ответ: 6,72