Question

me ajudem por favor !​

Answer 1

Resposta:

a)

$\sf \dfrac{2}{3} \div \dfrac{4}{5} + \dfrac{1}{2} \\\\\dfrac{2}{3} \times \dfrac{5}{4} + \dfrac{1}{2} \\\\\dfrac{10}{12} + \dfrac{1}{2} \\\\\dfrac{10}{12} + \dfrac{6}{12} \\\\\dfrac{16}{12} = \dfrac{5}{6}$

b)

$\sf \dfrac{1}{2} - \dfrac{5}{8} \div \dfrac{5}{4} \\\\\dfrac{1}{2} - \dfrac{5}{8} \times \dfrac{4}{5} \\\\\dfrac{1}{2} -\dfrac{20}{40} \\\\\dfrac{20}{40} -\dfrac{20}{40} = 0$

Explicação passo-a-passo: