\(\left(6-\dfrac{14}{5}\right)\) . \(\dfrac{25}{8}\) - \(\dfrac{18}{5}\) . \(\dfrac{1}{4}\)

=\(\left(\dfrac{30}{5}-\dfrac{14}{5}\right)\) . \(\dfrac{25}{8}\) - \(\dfrac{18}{5}\) .\(\dfrac{1}{4}\)

= \(\dfrac{16}{5}\) . \(\dfrac{25}{8}\) - \(\dfrac{9}{10}\)

= \(\dfrac{16.25}{5.8}\) - \(\dfrac{9}{10}\)

= \(\dfrac{2.5}{1}\) - \(\dfrac{9}{10}\)

= 10 -\(\dfrac{9}{10}\)

= \(\dfrac{100}{10}\) - \(\dfrac{9}{10}\)

= \(\dfrac{91}{10}\) = 9,1