Question

aflati termenul necunoscut al proportiei 0,8 supra lui 0,5 = 5 pe x

Answer 1

 

$\displaystyle\bf\\ \frac{0,8}{0,5}=\frac{5}{x}\\\\\\x=\frac{0,5\cdot5}{0,8}\\\\\\x=\frac{2,5}{0,8}\\\\\\x=\frac{25}{8}\\\\\\\boxed{\bf~x=3,\!125}$