22. Найдите сумму или разность.

Решение:

1. \(\frac{21}{66} + \frac{22}{66} = \frac{21+22}{66} = \frac{43}{66}\)
2. \(\frac{21}{10} - \frac{1}{10} = \frac{21-1}{10} = \frac{20}{10} = 2\)
3. \(\frac{44}{23} - \frac{10}{23} = \frac{44-10}{23} = \frac{34}{23} = 1\frac{11}{23}\)
4. \(\frac{41}{100} + \frac{77}{100} = \frac{41+77}{100} = \frac{118}{100} = 1\frac{18}{100} = 1\frac{9}{50}\)
5. \(\frac{65}{15} - \frac{24}{15} = \frac{65-24}{15} = \frac{41}{15} = 2\frac{11}{15}\)
6. \(\frac{55}{9} - \frac{12}{9} = \frac{55-12}{9} = \frac{43}{9} = 4\frac{7}{9}\)
7. \(\frac{66}{20} - \frac{43}{20} = \frac{66-43}{20} = \frac{23}{20} = 1\frac{3}{20}\)
8. \(\frac{36}{31} - \frac{5}{31} = \frac{36-5}{31} = \frac{31}{31} = 1\)
9. \(\frac{21}{25} + \frac{44}{25} = \frac{21+44}{25} = \frac{65}{25} = 2\frac{15}{25} = 2\frac{3}{5}\)
10. \(\frac{16}{23} + \frac{2}{23} + \frac{11}{23} = \frac{16+2+11}{23} = \frac{29}{23} = 1\frac{6}{23}\)

Ответ: 1. $$\frac{43}{66}$$; 2. $$2$$; 3. $$1\frac{11}{23}$$; 4. $$1\frac{9}{50}$$; 5. $$2\frac{11}{15}$$; 6. $$4\frac{7}{9}$$; 7. $$1\frac{3}{20}$$; 8. $$1$$; 9. $$2\frac{3}{5}$$; 10. $$1\frac{6}{23}$$.