Question

aratati ca (1 pe 2 + 1pe 5 ) × 20pe 7 = 2

Answer 1

$(\frac{1}{2} + \frac{1}{5} )* \frac{20}{7} =2$
$= \frac{5+2}{10} * \frac{20}{7}$
$= \frac{7}{10} * \frac{20}{7}$ (se simplifica 7 cu 7 si 10 cu 20)
$\bold{=2}$