[tex]\frac{a}{b}=\frac{2}{7} \ \textless \ =\ \textgreater \ \frac{a}{2}=\frac{b}{7}=k=\ \textgreater \ a=2k, \ b=7k =\ \textgreater \ \\ =\ \textgreater \ \frac{a+b}{b-a}=\frac{2k+7k}{7k-2k}=\frac{9k}{5k}=\frac{9}{5}[/tex]
Valoarea raportului este 9 pe 5.
