Question

determine o valor das expressões numéricas. conta completa ​

Answer 1

$( \frac{2}{7} \times \frac{1}{4} ) \div ( \frac{3}{4} - \frac{1}{5} ) \\ = \frac{2}{28} \div ( \frac{15 - 4}{20} ) \\ = \frac{2}{28} \div \frac{11}{20}$

$\frac{2}{28} \times \frac{20}{11} = \frac{1}{14} \times \frac{20}{11} = \frac{10}{77}$