Приведи дроби к общему знаменателю

1. \(\dfrac{3}{4}\) и \(\dfrac{4}{5} = \) [ \(\frac{15}{20}\) и \(\frac{16}{20}\) | \(\frac{4}{20}\) и \(\frac{3}{20}\) ]
2. \(\dfrac{5}{8}\) и \(\dfrac{7}{12} = \) [ \(\frac{15}{24}\) и \(\frac{14}{24}\) | \(\frac{9}{12}\) и \(\frac{7}{12}\) ]
3. \(\dfrac{7}{30}\) и \(\dfrac{3}{10} = \) [ \(\frac{7}{10}\) и \(\frac{9}{10}\) | \(\frac{7}{30}\) и \(\frac{9}{30}\) ]