1) Вычислите: а) 5/4 + 1/4; б) 7/9 − 3/9; в) 2/5 − 1/5; г) 8/10 + 1/10; д) 3/8 + 3/8; е) 6/7 + 1/7.

1. \(\frac{5}{4}+\frac{1}{4}=\frac{6}{4}=\frac{3}{2}\).
2. \(\frac{7}{9}-\frac{3}{9}=\frac{4}{9}\).
3. \(\frac{2}{5}-\frac{1}{5}=\frac{1}{5}\).
4. \(\frac{8}{10}+\frac{1}{10}=\frac{9}{10}\).
5. \(\frac{3}{8}+\frac{3}{8}=\frac{6}{8}=\frac{3}{4}\).
6. \(\frac{6}{7}+\frac{1}{7}=\frac{7}{7}=1\).

Ответ: а) \(\frac{3}{2}\); б) \(\frac{4}{9}\); в) \(\frac{1}{5}\); г) \(\frac{9}{10}\); д) \(\frac{3}{4}\); е) \(1\).