Thực hiện các phép tính: \(1\dfrac{5}{{15}}.0,75 - \left( {\dfrac{{11}}{{20}} + 25\% } \right):\dfrac{3}{5}\)

* Hướng dẫn giải

\(\begin{array}{l}d)1\dfrac{5}{{15}}.0,75 - \left( {\dfrac{{11}}{{20}} + 25\% } \right):\dfrac{3}{5}\\ = \dfrac{{20}}{{15}}.\dfrac{3}{4} - \left( {\dfrac{{11}}{{20}} + \dfrac{{25}}{{100}}} \right):\dfrac{3}{5}\\ = \dfrac{4}{3}.\dfrac{3}{4} - \left( {\dfrac{{11}}{{20}} + \dfrac{5}{{20}}} \right).\dfrac{5}{3}\\ = \,\,\,\,\,1\,\,\,\,\, - \,\,\,\,\,\,\,\,\,\,\dfrac{3}{4}.\dfrac{5}{3}\\ = \,\,\,\,\,1\,\,\,\,\, - \,\,\,\,\,\,\,\,\,\,\dfrac{5}{4}\\ = \dfrac{{ - 1}}{4}\end{array}\)