Пожалуйста решите!!!

$1) ( \frac{3}{4} + \frac{1}{5} ) * \frac{5}{19} =\\ =( \frac{15}{20} + \frac{4}{20} ) * \frac{5}{19} =\\ =\frac{19}{20} * \frac{5}{19} =\\ =\frac{5}{20} = \frac{1}{4}$

Ответ: $\frac{1}{4}$

$2) (12 \frac{1}{3} -7 \frac{3}{4} )* \frac{6}{11} =\\ =(12 \frac{4}{12} -7 \frac{9}{12} )* \frac{6}{11} =\\ =(11 \frac{16}{12} -7 \frac{9}{12} )* \frac{6}{11} =\\ =4 \frac{7}{12} * \frac{6}{11} =\\ =\frac{55}{12} * \frac{6}{11} =\\ =\frac{5}{2} =2 \frac{1}{2}$

Ответ: $2 \frac{1}{2}$

$3) (2 \frac{3}{5} - \frac{5}{8} ):19 \frac{3}{4} =\\ (2 \frac{24}{40} - \frac{25}{40} ): \frac{79}{4} =\\ =(1 \frac{64}{40} - \frac{25}{40} )* \frac{4}{79} =\\ = 1\frac{39}{40} * \frac{4}{79} =\\ = \frac{79}{40} * \frac{4}{79} =\\ = \frac{1}{10}$

Ответ: $\frac{1}{10}$