Question

DAU COROANA
Daca x/y=2/3 atunci 2x/2x+5y=?​

Answer 1

Salut!

x/y=2/3 ⇔ 3x=2y ⇔ x=2y/3

2x/(2x+5y)=

(2·2y/3)/(2·2y/3 + 5y)=

(4y/3)/(4y/3 + 15y/3)=

(4y/3)/(19y/3)=

4y/3 · 3/19y=

3 si y se simplifica si iasa asa

=4/19

Succes!

Answer 2

$\dfrac{x}{y} = \dfrac{2}{3}$

${\dfrac{2x}{2x+5y}}^{^{\displaystyle (y}} = \dfrac{2\cdot \frac{x}{y}}{2\cdot \frac{x}{y}+5} =\!{^{^{^{^{^{^{\displaystyle 3)}}}}}}}\!\!\dfrac{2\cdot \frac{2}{3}}{2\cdot \frac{2}{3}+5} = \dfrac{2\cdot 2}{2\cdot 2+3\cdot 5} = \dfrac{4}{19}$