2 1 25 9

3) $$\frac{2}{25} + \frac{1}{9} = \frac{2 \cdot 9}{25 \cdot 9} + \frac{1 \cdot 25}{9 \cdot 25} = \frac{18}{225} + \frac{25}{225} = \frac{18+25}{225} = \frac{43}{225}$$

Ответ: $$\frac{43}{225}$$