Вычислите: а) 7 16/21 + 1 5/14; б) 4 1/3 − 3 5/6; а) 4 11/15 + 2 7/20; б) 5 2/7 − 4 11/14.

1. \(7\frac{16}{21}+1\frac{5}{14}=8+\frac{32}{42}+\frac{15}{42}=8+\frac{47}{42}=9\frac{5}{42}\).

2. \(4\frac{1}{3}-3\frac{5}{6}=3\frac{8}{6}-3\frac{5}{6}=2\frac{1}{2}\).

3. \(4\frac{11}{15}+2\frac{7}{20}=6+\frac{44}{60}+\frac{21}{60}=7\frac{1}{12}\).

4. \(5\frac{2}{7}-4\frac{11}{14}=4\frac{18}{14}-4\frac{11}{14}=\frac{1}{2}\).

Ответ: а) 9 5/42; б) 2 1/2; а) 7 1/12; б) 1/2.