Question

1:Se stie ca 7 x+y supra y egal cu 21 supra 16,aflati valoarea raportului x supra y Urgent...

Answer 1

$\frac{7x+y}{y} = \frac{21}{16}$
$\frac{7x}{y} + \frac{y}{y} = \frac{21}{16}$$\frac{7x}{y} +1= \frac{21}{16}$
$\frac{7x}{y} = \frac{21}{16} -1$
aducem la acelasi numitor in partea dreapta
$\frac{7x}{y} = \frac{21-16}{16} = \frac{5}{16}$
impartim cu 7 totul
$\frac{x}{y} = \frac{5}{7*16} = \frac{5}{112}$