1. Найдите значение выражения: а) \(7\frac{11}{12}:3\frac{1}{6}\); б) \(\frac{3\frac{2}{5}}{2\frac{4}{15}}\); в) \(\frac{3,4}{20,4}\); г) \(\frac{1,71}{1\frac{4}{5}}\).

1. \(7\frac{11}{12}:3\frac{1}{6}=\frac{95}{12}:\frac{19}{6}=\frac{95}{12}\cdot\frac{6}{19}=\frac52=2\frac12\).
2. \(3\frac25:2\frac4{15}=\frac{17}{5}:\frac{34}{15}=\frac{17}{5}\cdot\frac{15}{34}=\frac32=1\frac12\).
3. \(3,4:20,4=\frac{34}{204}=\frac16\).
4. \(1,71:1\frac45=1,71:1,8=\frac{171}{180}=\frac{19}{20}=0,95\).

Ответ: а) \(2\frac12\); б) \(1\frac12\); в) \(\frac16\); г) \(0,95\).