Вычислите: а) 4/11 + 1/11; б) 3/15 − 1/15; в) 3/8 + 5/6 + 1; г) 9/12 + 3/4 − 1/6; е) 16/7 : 1/8; ж) 7/12 : 5/26; з) 5/11 : 3/11 · 3/5.

1. \(\frac{4}{11}+\frac{1}{11}=\frac{5}{11}\).
2. \(\frac{3}{15}-\frac{1}{15}=\frac{2}{15}\).
3. \(\frac{3}{8}+\frac{5}{6}+1=\frac{9}{24}+\frac{20}{24}+1=\frac{29}{24}+1=\frac{53}{24}=2\frac{5}{24}\).
4. \(\frac{9}{12}+\frac{3}{4}-\frac{1}{6}=\frac{3}{4}+\frac{3}{4}-\frac{1}{6}=\frac{3}{2}-\frac{1}{6}=\frac{9}{6}-\frac{1}{6}=\frac{8}{6}=\frac{4}{3}=1\frac{1}{3}\).
5. \(\frac{16}{7}:\frac{1}{8}=\frac{16}{7}\cdot 8=\frac{128}{7}=18\frac{2}{7}\).
6. \(\frac{7}{12}:\frac{5}{26}=\frac{7}{12}\cdot\frac{26}{5}=\frac{91}{30}=3\frac{1}{30}\).
7. \(\frac{5}{11}:\frac{3}{11}\cdot\frac{3}{5}=\frac{5}{11}\cdot\frac{11}{3}\cdot\frac{3}{5}=1\).

Ответ: а) \(\frac{5}{11}\); б) \(\frac{2}{15}\); в) \(2\frac{5}{24}\); г) \(1\frac{1}{3}\); е) \(18\frac{2}{7}\); ж) \(3\frac{1}{30}\); з) \(1\).