Ответ:

3) \( 6 \frac{7}{24} + 2 \frac{5}{16} = 6 \frac{7 \cdot 2}{24 \cdot 2} + 2 \frac{5 \cdot 3}{16 \cdot 3} = 6 \frac{14}{48} + 2 \frac{15}{48} = (6+2) + \frac{14+15}{48} = 8 \frac{29}{48} \)