Найти значение выражений 1/5+3/8-2/9; 3/4+5/12-1/9; 4/15+2/5+7/10

Решите задачу:

$\frac{1}{5} + \frac{3}{8} - \frac{2}{9} = \frac{72}{360} + \frac{135}{360} - \frac{80}{360} = \frac{127}{360}$
$\frac{3}{4} + \frac{5}{12} - \frac{1}{9} = \frac{27}{36} + \frac{15}{36} - \frac{4}{36} = \frac{38}{36} =1 \frac{2}{36} =1 \frac{1}{18}$
$\frac{4}{15} + \frac{2}{5} + \frac{7}{10} = \frac{8}{30} + \frac{12}{30} + \frac{21}{30} = \frac{41}{30} =1 \frac{11}{30}$