X-3y/x+2y=1/4. Determinați 2x-y/x+2y

Răspuns :

[tex]\it \dfrac{x-3y}{x+2y}= \dfrac{1}{4}\ \Rightarrow\ \dfrac{x-3y+x+2y}{x+2y} = \dfrac{1+4}{4}\ \Rightarrow\ \dfrac{2x-y}{x+2y} = \dfrac{5}{4}[/tex]