Dưới đây là các phép tính được thực hiện:

1) \(\frac{2}{3} + \frac{5}{8} + \frac{1}{6}\)
- Quy đồng mẫu số: \( \frac{2}{3} = \frac{16}{24}, \frac{5}{8} = \frac{15}{24}, \frac{1}{6} = \frac{4}{24} \)
- Cộng các phân số: \( \frac{16}{24} + \frac{15}{24} + \frac{4}{24} = \frac{35}{24} \)

2) \(\frac{2}{5} + \frac{1}{10} + \frac{10}{7}\)
- Quy đồng mẫu số: \( \frac{2}{5} = \frac{4}{10}, \frac{1}{10} = \frac{1}{10}, \frac{10}{7} = \frac{100}{70} \)
- Cộng các phân số: \( \frac{4}{10} + \frac{1}{10} + \frac{100}{70} = \frac{5}{10} + \frac{100}{70} = \frac{1}{2} + \frac{100}{70} = \frac{35}{70} + \frac{100}{70} = \frac{135}{70} = \frac{27}{14} \)

3) \(\frac{3}{5} - \frac{2}{3} + \frac{4}{7}\)
- Quy đồng mẫu số: \( \frac{3}{5} = \frac{9}{15}, \frac{2}{3} = \frac{10}{15}, \frac{4}{7} = \frac{12}{21} \)
- Cộng các phân số: \( \frac{9}{15} - \frac{10}{15} + \frac{12}{21} = \frac{-1}{15} + \frac{12}{21} = \frac{-7}{105} + \frac{60}{105} = \frac{53}{105} \)

4) \(\frac{2}{3} + \frac{3}{4} - \frac{4}{9}\)
- Quy đồng mẫu số: \( \frac{2}{3} = \frac{8}{12}, \frac{3}{4} = \frac{9}{12}, \frac{4}{9} = \frac{4}{9} \)
- Cộng các phân số: \( \frac{8}{12} + \frac{9}{12} - \frac{4}{9} = \frac{17}{12} - \frac{4}{9} = \frac{51}{36} - \frac{16}{36} = \frac{35}{36} \)

5) \(\frac{2}{5} + \frac{1}{3} - \frac{3}{4}\)
- Quy đồng mẫu số: \( \frac{2}{5} = \frac{24}{60}, \frac{1}{3} = \frac{20}{60}, \frac{3}{4} = \frac{45}{60} \)
- Cộng các phân số: \( \frac{24}{60} + \frac{20}{60} - \frac{45}{60} = \frac{44}{60} - \frac{45}{60} = \frac{-1}{60} \)

6) \(\frac{3}{4} - \frac{3}{4} + \frac{9}{9}\)
- Quy đồng mẫu số: \( \frac{3}{4} = \frac{3}{4}, \frac{3}{4} = \frac{3}{4}, \frac{9}{9} = \frac{1}{1} \)
- Cộng các phân số: \( \frac{3}{4} - \frac{3}{4} + \frac{1}{1} = 0 + 1 = 1 \)

7) \(\frac{-5}{4} + \frac{3}{7} + \frac{21}{8}\)
- Quy đồng mẫu số: \( \frac{-5}{4} = \frac{-10}{8}, \frac{3}{7} = \frac{24}{56}, \frac{21}{8} = \frac{21}{8} \)
- Cộng các phân số: \( \frac{-10}{8} + \frac{24}{56} + \frac{21}{8} = \frac{-10}{8} + \frac{3}{7} + \frac{21}{8} = \frac{-10}{8} + \frac{21}{8} = \frac{11}{8} + \frac{3}{7} = \frac{77}{56} + \frac{24}{56} = \frac{101}{56} \)

8) \(\frac{7}{12} + \frac{27}{18} + \frac{1}{7}\)
- Quy đồng mẫu số: \( \frac{7}{12} = \frac{14}{24}, \frac{27}{18} = \frac{27}{18}, \frac{1}{7} = \frac{1}{7} \)
- Cộng các phân số: \( \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + \frac{1}{7} = \frac{14}{24} + \frac{27}{18} + 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