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

1. [latex]( 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} [/latex]3. [latex]( 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} [/latex]5. [latex]( 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} [/latex]