Задание 1

Выполним сложение и вычитание дробей:

1. 
   $$\frac{2}{5} + \frac{1}{5} = \frac{2+1}{5} = \frac{3}{5}$$
   


2. 
   $$\frac{11}{18} - \frac{3}{18} = \frac{11-3}{18} = \frac{8}{18} = \frac{4}{9}$$
   


3. 
   $$\frac{15}{24} + \frac{3}{24} = \frac{15+3}{24} = \frac{18}{24} = \frac{3}{4}$$
   


4. 
   $$\frac{16}{27} - \frac{9}{27} = \frac{16-9}{27} = \frac{7}{27}$$
   


5. 
   $$\frac{16}{73} + \frac{52}{73} = \frac{16+52}{73} = \frac{68}{73}$$
   


6. 
   $$\frac{12}{65} + \frac{47}{65} = \frac{12+47}{65} = \frac{59}{65}$$
   


7. 
   $$\frac{45}{92} - \frac{33}{92} = \frac{45-33}{92} = \frac{12}{92} = \frac{3}{23}$$
   


8. 
   $$\frac{13}{49} + \frac{22}{49} = \frac{13+22}{49} = \frac{35}{49} = \frac{5}{7}$$
   


9. 
   $$\frac{5}{9} + \frac{1}{9} = \frac{5+1}{9} = \frac{6}{9} = \frac{2}{3}$$
   


10. 
    $$\frac{36}{42} - \frac{11}{42} = \frac{36-11}{42} = \frac{25}{42}$$
    


11. 
    $$\frac{74}{99} - \frac{64}{99} = \frac{74-64}{99} = \frac{10}{99}$$
    


12. 
    $$\frac{9}{47} + \frac{36}{47} = \frac{9+36}{47} = \frac{45}{47}$$
    


13. 
    $$\frac{51}{65} - \frac{17}{65} = \frac{51-17}{65} = \frac{34}{65}$$
    


14. 
    $$\frac{2}{31} + \frac{17}{31} = \frac{2+17}{31} = \frac{19}{31}$$
    


15. 
    $$\frac{18}{54} - \frac{9}{54} = \frac{18-9}{54} = \frac{9}{54} = \frac{1}{6}$$
    


16. 
    $$\frac{49}{89} - \frac{36}{89} = \frac{49-36}{89} = \frac{13}{89}$$