Calculate
1. a) \(\frac{1}{7} + \frac{2}{3} \),
2. b) \(\frac{1}{7} - \frac{2}{3} \),
3. c) \(\frac{1}{7} \times \frac{2}{3} \),
4. d) \(\frac{1}{7} / \frac{2}{3} \),
5. e) \(\frac{3}{14} \left(\frac{2}{3} + 4 \right) \),
6. f) \( \left( \frac{1}{9} + \frac{7}{3} \right) / \left(2 + \frac{26}{9} \right) \)

Calculate
1. a) \(\frac{1}{7} + \frac{2}{3} \),
2. b) \(\frac{1}{7} - \frac{2}{3} \),
3. c) \(\frac{1}{7} \times \frac{2}{3} \),
4. d) \(\frac{1}{7} / \frac{2}{3} \),
5. e) \(\frac{3}{14} \left(\frac{2}{3} + 4 \right) \),
6. f) \( \left( \frac{1}{9} + \frac{7}{3} \right) / \left(2 + \frac{26}{9} \right) \)