6. Выполните действие: а) 6+5/13; 6/57+4; 6 4/9+5 2/9; 11 8/11−3 5/11; 8 7/18+7 5/18−4 11/18; 13 6/10−5 3/10+16 1/10; 3 8/11+2 6/11; 1−16/21; 5−2 3/8; 8 4/9−3 7/9. б) Решите уравнение: 4 5/14−(x−7 3/14)=2 9/14.

а)

1. \(6+\frac{5}{13}=6\frac{5}{13}\).
2. \(\frac{6}{57}+4=\frac{2}{19}+4=4\frac{2}{19}\).
3. \(6\frac{4}{9}+5\frac{2}{9}=11\frac{6}{9}=11\frac{2}{3}\).
4. \(11\frac{8}{11}-3\frac{5}{11}=8\frac{3}{11}\).
5. \(8\frac{7}{18}+7\frac{5}{18}-4\frac{11}{18}=15\frac{12}{18}-4\frac{11}{18}=11\frac{1}{18}\).
6. \(13\frac{6}{10}-5\frac{3}{10}+16\frac{1}{10}=24\frac{4}{10}=24\frac{2}{5}\).
7. \(3\frac{8}{11}+2\frac{6}{11}=6\frac{3}{11}\).
8. \(1-\frac{16}{21}=\frac{5}{21}\).
9. \(5-2\frac{3}{8}=2\frac{5}{8}\).
10. \(8\frac{4}{9}-3\frac{7}{9}=4\frac{6}{9}=4\frac{2}{3}\).

б)

\[4\frac{5}{14}-x+7\frac{3}{14}=2\frac{9}{14}\]

\[11\frac{8}{14}-x=2\frac{9}{14}\]

\[x=11\frac{8}{14}-2\frac{9}{14}=7\frac{13}{14}\]

Ответ: а) 6 5/13; 4 2/19; 11 2/3; 8 3/11; 11 1/18; 24 2/5; 6 3/11; 5/21; 2 5/8; 4 2/3. б) x=7 13/14.