Question

resultado destas fraçoes 1/6+2/9,3/4-1/5,4/7-3/8 e 3/4-1/8-2/7

Answer 1

$\frac{1}{6}+\frac{2}{9}=\frac{3+2}{18}=\frac{5}{18} \\ \\ \frac{3}{4}-\frac{1}{5}=\frac{15-4}{20}=\frac{11}{20}\\ \\ \\ \frac{4}{7}-\frac{3}{8}=\frac{32-21}{56}=\frac{11}{56} \\ \\ \frac{3}{4}-\frac{1}{8}-\frac{2}{7}=\frac{42-8-14}{56}=\frac{20}{56}=\frac{10}{23}$