Помогите 993(1,3,5),пожалуйста.5 класс.

1. $( \frac{7}{15} - \frac{1}{6} )+ \frac{2}{5} = ( \frac{14}{30} - \frac{5}{30} )+ \frac{2}{5} = \frac{9}{30} + \frac{2}{5} = \frac{9}{30} + \frac{12}{30} = \frac{21}{30} = \frac{7}{10}$

3. $( \frac{8}{9} - \frac{5}{6}) + \frac{2}{3} = (\frac{16}{18} - \frac{15}{18}) + \frac{2}{3} = \frac{1}{18} + \frac{12}{18} = \frac{13}{18}$

5. $( \frac{7}{18} - \frac{1}{12} ) + \frac{5}{6} = (\frac{14}{36} - \frac{3}{36} )+ \frac{5}{6} = \frac{11}{36} + \frac{30}{36} = \frac{41}{36} =1 \frac{5}{36}$