Tính.

\(\frac{3}{2}\) + \(\frac{1}{{14}}\) = \(\frac{{21}}{{14}}\) + \(\frac{1}{{14}}\) = \(\frac{{22}}{{14}}\) = \(\frac{{11}}{7}\)

\(\frac{{25}}{{17}}\) – \(\frac{{10}}{{34}}\) = \(\frac{{50}}{{34}}\) – \(\frac{{10}}{{34}}\) = \(\frac{{40}}{{34}}\) = \(\frac{{20}}{{17}}\)

\(\frac{7}{9}\) × \(\frac{6}{{21}}\) = \(\frac{2}{9}\)

\(\frac{{70}}{{19}}\) : \(\frac{{10}}{{38}}\) = \(\frac{{70}}{{19}}\) × \(\frac{{38}}{{10}}\) = 14