Tính: phép tính

a) \(\frac{{12}}{{14}} \times \frac{6}{9}\)

= \(\frac{6}{7} \times \frac{2}{3}\) = \(\frac{{12}}{{21}} = \frac{4}{7}\)

b) \(\frac{1}{8} \times \frac{{10}}{7}\)

= \(\frac{{10}}{{56}} = \frac{5}{{28}}\)

c) \(\frac{6}{7} \times \frac{7}{6}\)

= \(\frac{{42}}{{42}}\) = 1

d) \(\frac{{11}}{2} \times \frac{1}{{22}}\)

= \(\frac{{11}}{{44}} = \frac{1}{4}\)