Математика

1. $$\frac{8}{10} + \frac{9}{10} = \frac{17}{10}$$
2. $$\frac{16}{15} - \frac{12}{15} = \frac{4}{15}$$
3. $$\frac{19}{20} - \frac{17}{20} = \frac{2}{20}$$
4. $$\frac{7}{15} + \frac{5}{15} = \frac{12}{15}$$
5. $$\frac{5}{6} + \frac{6}{6} = \frac{11}{6}$$
6. $$\frac{11}{14} - \frac{9}{14} = \frac{2}{14}$$
7. $$\frac{12}{9} + \frac{11}{9} = \frac{23}{9}$$
8. $$\frac{19}{30} - \frac{4}{30} = \frac{15}{30}$$
9. $$\frac{11}{16} - \frac{8}{16} = \frac{3}{16}$$
10. $$\frac{12}{7} + \frac{9}{7} = \frac{21}{7}$$
11. $$\frac{17}{20} - \frac{11}{20} = \frac{6}{20}$$
12. $$\frac{9}{50} + \frac{23}{50} = \frac{32}{50}$$
13. $$\frac{8}{25} + \frac{13}{25} = \frac{21}{25}$$
14. $$\frac{24}{18} - \frac{17}{18} = \frac{7}{18}$$
15. $$\frac{32}{40} + \frac{25}{40} = \frac{57}{40}$$
16. $$\frac{35}{32} - \frac{18}{32} = \frac{17}{32}$$
17. $$\frac{27}{50} + \frac{22}{50} = \frac{49}{50}$$
18. $$\frac{18}{20} - \frac{7}{20} = \frac{11}{20}$$