ЗАДАНИЯ Найти произведения: 1 5 2 6 5 4- 9 1 1.21 3 4 4 5 5 7 11.2 23 81 93 5.3 13 31.11 32 83 95 2.1.2 25 42 93 7.2 9 7.11 87 7.51 83 2.1 4 11

Ответ: Решения ниже

Решаем примеры:

1. 
   \[\frac{1}{2} \cdot \frac{5}{6} = \frac{1 \cdot 5}{2 \cdot 6} = \frac{5}{12}\]
   


2. 
   \[4 \cdot \frac{5}{9} = \frac{4 \cdot 5}{9} = \frac{20}{9} = 2\frac{2}{9}\]
   


3. 
   \[1\frac{1}{3} \cdot 2\frac{1}{4} = \frac{4}{3} \cdot \frac{9}{4} = \frac{4 \cdot 9}{3 \cdot 4} = \frac{9}{3} = 3\]
   


4. 
   \[\frac{4}{5} \cdot \frac{5}{7} = \frac{4 \cdot 5}{5 \cdot 7} = \frac{4}{7}\]
   


5. 
   \[1\frac{1}{2} \cdot \frac{2}{3} = \frac{3}{2} \cdot \frac{2}{3} = \frac{3 \cdot 2}{2 \cdot 3} = \frac{6}{6} = 1\]
   


6. 
   \[\frac{8}{9} \cdot \frac{1}{3} = \frac{8 \cdot 1}{9 \cdot 3} = \frac{8}{27}\]
   


7. 
   \[\frac{5}{13} \cdot 3 = \frac{5 \cdot 3}{13} = \frac{15}{13} = 1\frac{2}{13}\]
   


8. 
   \[3\frac{1}{3} \cdot 1\frac{1}{2} = \frac{10}{3} \cdot \frac{3}{2} = \frac{10 \cdot 3}{3 \cdot 2} = \frac{10}{2} = 5\]
   


9. 
   \[\frac{8}{9} \cdot \frac{3}{5} = \frac{8 \cdot 3}{9 \cdot 5} = \frac{24}{45} = \frac{8}{15}\]
   


10. 
    \[2\frac{1}{2} \cdot \frac{2}{5} = \frac{5}{2} \cdot \frac{2}{5} = \frac{5 \cdot 2}{2 \cdot 5} = \frac{10}{10} = 1\]
    


11. 
    \[\frac{4}{9} \cdot \frac{2}{3} = \frac{4 \cdot 2}{9 \cdot 3} = \frac{8}{27}\]
    


12. 
    \[\frac{7}{9} \cdot 2 = \frac{7 \cdot 2}{9} = \frac{14}{9} = 1\frac{5}{9}\]
    


13. 
    \[2\frac{3}{4} \cdot 1\frac{1}{11} = \frac{11}{4} \cdot \frac{12}{11} = \frac{11 \cdot 12}{4 \cdot 11} = \frac{12}{4} = 3\]
    


14. 
    \[\frac{7}{8} \cdot 1\frac{1}{7} = \frac{7}{8} \cdot \frac{8}{7} = \frac{7 \cdot 8}{8 \cdot 7} = \frac{56}{56} = 1\]
    


15. 
    \[\frac{7}{8} \cdot 5\frac{1}{3} = \frac{7}{8} \cdot \frac{16}{3} = \frac{7 \cdot 16}{8 \cdot 3} = \frac{112}{24} = \frac{14}{3} = 4\frac{2}{3}\]
    

Ответ: Решения выше