12.12.2025, 09:02 Е. А. Ширяева (www.time4math.ru) Выполни действие: 27 +49 13) 28+4=436 14) 47+217= 20 20+20= 15) 23+11= 26 26 16) 310+511= 1313 17)+5= 11 11 7 18) 710+310 19) 7+11 19 19 20) 14+514= 21) 7+13= 8 8 22) 31+120= 23) 9+12 12 24) 1710+50 10 9 7 = 7= 9

Решим данные примеры:

1. $$ \frac{27}{28} + \frac{4}{28} = \frac{27 + 4}{28} = \frac{31}{28} = 1\frac{3}{28} $$
   

   Ответ: $$ 1\frac{3}{28} $$

2. $$ \frac{4}{20} + \frac{17}{20} = \frac{4 + 17}{20} = \frac{21}{20} = 1\frac{1}{20} $$
   

   $$ 1\frac{1}{20} + \frac{20}{20} = \frac{1}{20} +1 + 1=2\frac{1}{20}$$

   Ответ: $$ 2\frac{1}{20} $$

3. $$ \frac{23}{26} + \frac{11}{26} = \frac{23 + 11}{26} = \frac{34}{26} = \frac{17}{13} = 1\frac{4}{13} $$
   

   Ответ: $$ 1\frac{4}{13} $$

4. $$ \frac{3}{13} + \frac{10}{13} + \frac{5}{13} = \frac{3 + 10 + 5}{13} = \frac{18}{13} = 1\frac{5}{13} $$
   

   Ответ: $$ 1\frac{5}{13} $$

5. $$ \frac{7}{11} + \frac{5}{11} = \frac{7 + 5}{11} = \frac{12}{11} = 1\frac{1}{11} $$
   

   Ответ: $$ 1\frac{1}{11} $$

6. $$ \frac{7}{10} + \frac{3}{10} = \frac{7 + 3}{10} = \frac{10}{10} = 1 $$
   

   Ответ: 1

7. $$ \frac{7}{19} + \frac{11}{19} = \frac{7 + 11}{19} = \frac{18}{19} $$
   

   Ответ: $$ \frac{18}{19} $$

8. $$ \frac{9}{14} + \frac{5}{14} = \frac{9 + 5}{14} = \frac{14}{14} = 1 $$
   

   Ответ: 1

9. $$ \frac{7}{8} + \frac{1}{8} = \frac{7 + 1}{8} = \frac{8}{8} = 1 $$
   

   Ответ: 1

10. $$ 3\frac{1}{9} + 12\frac{8}{9} = 3 + 12 + \frac{1}{9} + \frac{8}{9} = 15 + \frac{1 + 8}{9} = 15 + \frac{9}{9} = 15 + 1 = 16 $$
    

    Ответ: 16

11. $$ \frac{9}{12} + \frac{7}{12} + \frac{1}{12} = \frac{9 + 7 + 1}{12} = \frac{17}{12} = 1\frac{5}{12} $$
    

    Ответ: $$ 1\frac{5}{12} $$

12. $$ 17\frac{9}{10} + 50\frac{7}{10} = 17 + 50 + \frac{9}{10} + \frac{7}{10} = 67 + \frac{9 + 7}{10} = 67 + \frac{16}{10} = 67 + 1\frac{6}{10} = 68\frac{6}{10} = 68\frac{3}{5} $$
    

    Ответ: $$68\frac{3}{5}$$