3\(\dfrac{1}{7}\) : \(\left\{\left[2-1\dfrac{3}{5}:\left(\dfrac{4}{3}-1,6\right)\right]-25\%\right\}\)
= \(\dfrac{22}{7}\) : \(\left\{\left[\dfrac{10}{5}-\dfrac{8}{5}:\left(\dfrac{4}{3}-\dfrac{8}{5}\right)\right]-\dfrac{1}{4}\right\}\)
= \(\dfrac{22}{7}\) : \(\left\{\left[\dfrac{10}{5}-\dfrac{8}{5}:\left(\dfrac{20}{15}-\dfrac{24}{15}\right)\right]-\dfrac{1}{4}\right\}\)
= \(\dfrac{22}{7}\) : \(\left\{\left[\dfrac{10}{5}-\dfrac{8}{5}:\dfrac{-4}{15}\right]-\dfrac{1}{4}\right\}\)
= \(\dfrac{22}{7}\) : \(\left\{\left[\dfrac{10}{5}-\dfrac{8}{5}.\dfrac{-15}{4}\right]-\dfrac{1}{4}\right\}\)
= \(\dfrac{22}{7}\) : \(\left\{\left[\dfrac{10}{5}-\dfrac{-30}{5}\right]-\dfrac{1}{4}\right\}\)
= \(\dfrac{22}{7}\) : \(\left\{8-\dfrac{1}{4}\right\}\)
= \(\dfrac{22}{7}\) : \(\left\{\dfrac{32}{4}-\dfrac{1}{4}\right\}\)
= \(\dfrac{22}{7}\) : \(\dfrac{31}{4}\)
= \(\dfrac{22}{7}\) . \(\dfrac{4}{31}\)
= \(\dfrac{88}{217}\)
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