г) 12/27 + 17/34

г)

\(\frac{12}{27} + \frac{17}{34} = \frac{4}{9} + \frac{1}{2} = \frac{4 \cdot 2}{9 \cdot 2} + \frac{1 \cdot 9}{2 \cdot 9} = \frac{8}{18} + \frac{9}{18} = \frac{8 + 9}{18} = \frac{17}{18}\)

Ответ: \(\frac{17}{18}\).