[tex] \frac{2w}{w-2} + \frac{w}{w-1} \\ \\w-2\neq 0 \ \ \wedge \ \ w-1\neq 0\\w \neq 2 \ \ \wedge \ \ w \neq 1\\D=R\setminus \left \{ 1,2 \right \} \\ \\\frac{2w}{w-2} + \frac{w}{w-1}=\frac{2w(w-1)+w(w-2)}{(w-1)(w-2)} =\frac{2w^2-2w+ w^2-2w}{(w-1)(w-2)} =\\\\=\frac{3w^2-4w }{(w-1)(w-2)} =\frac{3w(w -4) }{(w-1)(w-2)} [/tex]
