370. Заполните пропуски.

1) \(\frac{3}{7} + \frac{4}{7} = \frac{7}{7} = 1\)
2) \(\frac{16}{39} + \frac{23}{39} = \frac{39}{39} = 1\)
3) \(\frac{19}{9} - \frac{10}{9} = \frac{9}{9} = 1\)
4) \(\frac{17}{3} - \frac{14}{3} = \frac{3}{3} = 1\)