Вычисли выражения с дробями.

Конечно, давай вычислим: 1. $\frac{2}{7} + \frac{3}{8} = \frac{16 + 21}{56} = \frac{37}{56}$ 2. $\frac{13}{6} - \frac{8}{7} = \frac{91 - 48}{42} = \frac{43}{42}$ 3. $\frac{15}{9} - \frac{11}{10} = \frac{150 - 99}{90} = \frac{51}{90} = \frac{17}{30}$ 4. $\frac{5}{7} - \frac{7}{9} = \frac{45 - 49}{63} = -\frac{4}{63}$ 5. $\frac{17}{8} - \frac{5}{2} = \frac{17 - 20}{8} = -\frac{3}{8}$ 6. $\frac{9}{6} - \frac{11}{10} = \frac{90 - 66}{60} = \frac{24}{60} = \frac{2}{5}$ 7. $\frac{2}{3} - \frac{15}{7} = \frac{14 - 45}{21} = -\frac{31}{21}$ 8. $\frac{10}{10} - \frac{6}{6} = 1 - 1 = 0$ 9. $\frac{20}{6} - \frac{18}{1} = \frac{20 - 108}{6} = -\frac{88}{6} = -\frac{44}{3}$ 10. $\frac{8}{5} - \frac{16}{6} = \frac{48 - 80}{30} = -\frac{32}{30} = -\frac{16}{15}$ 11. $\frac{11}{2} - \frac{5}{6} = \frac{66 - 5}{12} = \frac{61}{12}$ 12. $\frac{25}{4} + \frac{13}{6} = \frac{150 + 26}{24} = \frac{176}{24} = \frac{22}{3}$ 13. $\frac{13}{1} + \frac{11}{3} = \frac{39 + 11}{3} = \frac{50}{3}$ 14. $\frac{10}{2} - \frac{14}{3} = \frac{30 - 28}{6} = \frac{2}{6} = \frac{1}{3}$ 15. $\frac{11}{11} - \frac{17}{17} = 1 - 1 = 0$ **Ответы:** 1. $\frac{37}{56}$ 2. $\frac{43}{42}$ 3. $\frac{17}{30}$ 4. $-\frac{4}{63}$ 5. $-\frac{3}{8}$ 6. $\frac{2}{5}$ 7. $-\frac{31}{21}$ 8. $0$ 9. $-\frac{44}{3}$ 10. $-\frac{16}{15}$ 11. $\frac{61}{12}$ 12. $\frac{22}{3}$ 13. $\frac{50}{3}$ 14. $\frac{1}{3}$ 15. $0$