Question

Daca x:y = 2:5 atunci aflati valoarea raportului 2x+y
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x+3y

Answer 1

$\frac{x}{y} = \frac{2}{5} =\ \textgreater \ x= \frac{2y}{5}$
$\frac{2* \frac{2y}{5} +y}{ \frac{2y}{5}+3y } = \frac{4y+5y}{2y+15y} = \frac{9y}{17y} = \frac{9}{17}$

Answer 2

x:y=2:5 adica x/y= 2/5
Inversam mezii.
x/2= y/5 = k
x/2=k => x= 2k
y/5=k=> y= 5k

Si acum inlocuim.
2x+ y/ x+3y

2×2k + 5k / 2k + 3× 5k = 4k+5k/ 2k+ 15k = 9k/ 17k
k cu k se simplifica si ramane.
9/17 ( valoarea raportului)

Sper ca te.am ajutat