Question

qual é o valor de A?

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Answer 1

$\sf A = \frac{ \frac{2}{3} \times \frac{3}{5} - \frac{1}{4} }{ \frac{1}{5} + \frac{1}{10} } \\ \\\sf A = \frac{2 \times \frac{1}{5} - \frac{1}{4} }{ \frac{1}{5} + \frac{1}{10} } \\ \\\sf A = \frac{ \frac{2}{5} - \frac{1}{4} }{ \frac{1}{5} + \frac{1}{10} } = \frac{ \frac{3}{20} }{ \frac{3}{10} } \\ \\\sf A = \frac{3}{20} \times \frac{10}{3} \\ \\\sf A = \frac{1}{20} \times 10 \\ \\\sf A = \frac{10}{20} \: \: ➝ \: \: \frac{1}{2} \\ \\ \\\sf Resposta: \red {d) 1/2}$