Question

Aflati numarul rational X , stiind ca :

A) 1 supra 2 din X este 4 supra 5.


Am mai multe dar facetimi doar asta ca exemplu!!!!! Va rău !!

Answer 1

$\frac{1}{2} x = \frac{4}{5} \\ \frac{x}{2} = \frac{4}{5} \\ 5x = 4 \times 2 \\ 5x = 8 \\ = > x = \frac{8}{5}$
Sau:
$\frac{1}{2} x = \frac{4}{5} | \times 2 \\ 2 \times \frac{1}{2} x = \frac{4}{5} \times 2 \\ x = \frac{8}{5}$

Answer 2

1/2  x = 4/5⇒ 5x = 2x4⇒x= 8/5 = 1 intreg si 3/5 sau x= 1,6