Question

calcule as expressões
a)2/3:4/5+1/2
b)2/10:7/5-1/5​

Answer 1

$\frac{\frac{2}{3} }{\frac{4}{5} } + \frac{1}{2} = \frac{5}{4} * \frac{2}{3} + \frac{1}{2} \\\frac{10}{12} + \frac{1}{2} = \frac{5}{6} + \frac{1}{2} \\\frac{5 + 3}{6} = \frac{8}{6} = \frac{4}{3}$

$\frac{\frac{2}{10} }{\frac{7}{5} } - \frac{1}{5} = \frac{5}{7} * \frac{2}{10} - \frac{1}{5} \\\frac{10}{70} - \frac{1}{5} = \frac{1}{7} - \frac{1}{5} \\\frac{5 - 7}{35} = -\frac{2}{35}$