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Давай пересчитаем примеры правильно. Вот верные ответы для всех выражений: 1. $\frac{1}{9} + \frac{1}{27} = \frac{3}{27} + \frac{1}{27} = \frac{4}{27}$ 2. $\frac{38}{49} - \frac{3}{7} = \frac{38}{49} - \frac{21}{49} = \frac{17}{49}$ 3. $\frac{2}{3} + \frac{1}{9} = \frac{6}{9} + \frac{1}{9} = \frac{7}{9}$ 4. $\frac{7}{8} + \frac{1}{2} = \frac{7}{8} + \frac{4}{8} = \frac{11}{8} = 1\frac{3}{8}$ 5. $\frac{5}{7} - \frac{1}{2} = \frac{10}{14} - \frac{7}{14} = \frac{3}{14}$ 6. $\frac{5}{6} - \frac{3}{5} = \frac{25}{30} - \frac{18}{30} = \frac{7}{30}$ 7. $\frac{1}{9} - \frac{1}{27} = \frac{3}{27} - \frac{1}{27} = \frac{2}{27}$ 8. $\frac{8}{9} - \frac{2}{7} = \frac{56}{63} - \frac{18}{63} = \frac{38}{63}$ 9. $\frac{7}{8} - \frac{1}{2} = \frac{7}{8} - \frac{4}{8} = \frac{3}{8}$ 10. $\frac{5}{26} + \frac{1}{6} = \frac{15}{78} + \frac{13}{78} = \frac{28}{78} = \frac{14}{39}$ 11. $\frac{1}{10} - \frac{1}{11} = \frac{11}{110} - \frac{10}{110} = \frac{1}{110}$ 12. $\frac{1}{3} + \frac{1}{7} = \frac{7}{21} + \frac{3}{21} = \frac{10}{21}$ 13. $\frac{2}{7} + \frac{7}{9} = \frac{18}{63} + \frac{49}{63} = \frac{67}{63} = 1\frac{4}{63}$ 14. $\frac{1}{2} + \frac{1}{8} = \frac{4}{8} + \frac{1}{8} = \frac{5}{8}$ 15. $\frac{3}{5} + \frac{5}{6} = \frac{18}{30} + \frac{25}{30} = \frac{43}{30} = 1\frac{13}{30}$ 16. $\frac{1}{2} - \frac{1}{8} = \frac{4}{8} - \frac{1}{8} = \frac{3}{8}$ 17. $\frac{1}{12} + \frac{1}{3} = \frac{1}{12} + \frac{4}{12} = \frac{5}{12}$ 18. $\frac{8}{9} - \frac{7}{8} = \frac{64}{72} - \frac{63}{72} = \frac{1}{72}$