Explicação passo-a-passo:
[tex] \frac{3}{4 + \frac{1}{3 + \frac{2}{5} } } = [/tex]
[tex] \frac{3}{4 + \frac{1}{ \frac{17}{5} } } = \frac{3}{4 + 1. \frac{5}{17} } = \frac{3}{4 + \frac{5}{17} } = \frac{3}{ \frac{68}{5} } = 3. \frac{5}{68} = \frac{15}{68} [/tex]
[tex]m = \frac{7 - 2 {}^{2} .(1 - \frac{4}{3}) }{1 + \frac{1}{4} } = \frac{7 - 4.( - \frac{1}{3}) }{ \frac{5}{4} } = \frac{7 + \frac{4}{3} }{ \frac{5}{4} } = \frac{ \frac{25}{3} }{ \frac{5}{4} } = \frac{25}{3} \times \frac{4}{5} = \frac{100}{15} \div \frac{5}{5} = \frac{20}{3} [/tex]
[tex]letra \: c)[/tex]
