Question

5 pe 4 + 7 pe 4 - 1 ori 3 pe 4 =

Answer 1

$\frac{5}{7} + \frac{7}{4} - 1 \times \frac{3}{4} = \\ = \frac{20}{28} + \frac{49}{28} - \frac{21}{28} = \\ = \frac{69}{28} - \frac{21}{28} = \frac{48}{28} = 1.(741285)$