46. Найдите значение выражений и запишите ответы: 1) 2 5/21 + 6/7; 2) 7 2/3 + 1 4/9; 3) 1 5/9 − 8/9; 4) 1 2/7 + 6/7; 5) 1 3/8 − 14/8; 6) 1 1/12 − 5/24; 7) 8 3/7 + 2 2/3; 8) 4 1/18 − 1 5/9; 9) 3 1/2 − 2/3.

1. \(2\frac{5}{21}+\frac{6}{7}=2\frac{5}{21}+\frac{18}{21}=2\frac{23}{21}=3\frac{2}{21}\).
2. \(7\frac{2}{3}+1\frac{4}{9}=8+\frac{6}{9}+\frac{4}{9}=9\frac{1}{9}\).
3. \(1\frac{5}{9}-\frac{8}{9}=\frac{14}{9}-\frac{8}{9}=\frac{2}{3}\).
4. \(1\frac{2}{7}+\frac{6}{7}=1\frac{8}{7}=2\frac{1}{7}\).
5. \(1\frac{3}{8}-\frac{14}{8}=\frac{11}{8}-\frac{14}{8}=-\frac{3}{8}\).
6. \(1\frac{1}{12}-\frac{5}{24}=1+\frac{2}{24}-\frac{5}{24}=\frac{21}{24}=\frac{7}{8}\).
7. \(8\frac{3}{7}+2\frac{2}{3}=10+\frac{9}{21}+\frac{14}{21}=11\frac{2}{21}\).
8. \(4\frac{1}{18}-1\frac{5}{9}=3+\frac{1}{18}-\frac{10}{18}=2\frac{1}{2}\).
9. \(3\frac{1}{2}-\frac{2}{3}=3+\frac{3}{6}-\frac{4}{6}=2\frac{5}{6}\).

Ответ: 1) \(3\frac{2}{21}\); 2) \(9\frac{1}{9}\); 3) \(\frac{2}{3}\); 4) \(2\frac{1}{7}\); 5) \(-\frac{3}{8}\); 6) \(\frac{7}{8}\); 7) \(11\frac{2}{21}\); 8) \(2\frac{1}{2}\); 9) \(2\frac{5}{6}\).