$a+\frac{2}{b}=3$
$b+\frac{2}{a}=2$
$\frac{a+b}{a-b}=?$
$ab+2=3b,\quad ab+2=2a\Rightarrow 2a=3b$ dir. $\frac{a+b}{a-b}=\frac{a+2a/3}{a-2a/3}=5$ olur.