7 1 -- + -- = 12 2

$$\frac{7}{12} + \frac{1}{2} = \frac{7}{12} + \frac{1 \cdot 6}{2 \cdot 6} = \frac{7}{12} + \frac{6}{12} = \frac{13}{12}$$

Ответ: $$\frac{13}{12}$$