Question

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

Answer 1

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