Сравните дроби: а) \(\frac{3}{4}\) и \(\frac{7}{12}\); б) \(\frac{4}{9}\) и \(\frac{5}{11}\); в) \(\frac{3}{5}\) и \(\frac{47}{75}\); г) \(\frac{19}{42}\) и \(\frac{23}{77}\).

1. а) \(\frac{3}{4}=\frac{9}{12}>\frac{7}{12}\).
2. б) \(4\cdot11=44\), а \(5\cdot9=45\), поэтому \(\frac{4}{9}<\frac{5}{11}\).
3. в) \(\frac{3}{5}=\frac{45}{75}<\frac{47}{75}\).
4. г) \(19\cdot77=1463\), а \(23\cdot42=966\), поэтому \(\frac{19}{42}>\frac{23}{77}\).

Ответ: а) \(\frac{3}{4}>\frac{7}{12}\); б) \(\frac{4}{9}<\frac{5}{11}\); в) \(\frac{3}{5}<\frac{47}{75}\); г) \(\frac{19}{42}>\frac{23}{77}\).