Espressione

$\big(\frac{3}{8}×\frac{4}{15}\big) : \big(\frac{5}{4} +\frac{1}{2}\big) = x : \big(\frac{1}{5}+\frac{1}{2}\big)$

$\frac{12}{120} : \big(\frac{5+2}{4}\big) = x : \big(\frac{2+5}{10}\big)$

$\frac{1}{10} : \frac{7}{4} = x : \frac{7}{10}$

$x= \frac{1}{10} × \frac{7}{10} : \frac{7}{4}$

$x= \frac{7}{100} × \frac{4}{7}$

$x= \frac{1}{25} × \frac{1}{1}$

$x= \frac{1}{25}$ oppure $x= 0,04$.