Đáp án:
$\begin{array}{l}
8)\dfrac{5}{{16}}:0,125 - \left( {2\dfrac{1}{4} - 0,6} \right).\dfrac{{10}}{{11}}\\
= \dfrac{5}{{16}}:\dfrac{1}{8} - \left( {\dfrac{9}{4} - \dfrac{3}{5}} \right).\dfrac{{10}}{{11}}\\
= \dfrac{5}{{16}}.8 - \left( {\dfrac{{45 - 12}}{{20}}} \right).\dfrac{{10}}{{11}}\\
= \dfrac{5}{2} - \dfrac{{33}}{{20}}.\dfrac{{10}}{{11}}\\
= \dfrac{5}{2} - \dfrac{3}{2}\\
= \dfrac{2}{2} = 1\\
9)1\dfrac{{13}}{{15}}.0,75 - \left( {\dfrac{{11}}{{20}} + 25\% } \right):\dfrac{7}{3}\\
= \dfrac{{28}}{{15}}.\dfrac{3}{4} - \left( {\dfrac{{11}}{{20}} + \dfrac{1}{4}} \right).\dfrac{3}{7}\\
= \dfrac{7}{5} - \left( {\dfrac{{11 + 5}}{{20}}} \right).\dfrac{3}{7}\\
= \dfrac{7}{5} - \dfrac{{16}}{{20}}.\dfrac{3}{7}\\
= \dfrac{7}{5} - \dfrac{{12}}{{35}}\\
= \dfrac{{49 - 12}}{{35}}\\
= \dfrac{{37}}{{35}}\\
10)0,25.1\dfrac{1}{3}.{\left( {\dfrac{5}{4}} \right)^2}:\left( { - \dfrac{4}{7}} \right)\\
= \dfrac{1}{4}.\dfrac{4}{3}.\dfrac{{25}}{{16}}.\left( { - \dfrac{7}{4}} \right)\\
= \dfrac{{ - 175}}{{192}}\\
11)\left( {25\% + \dfrac{1}{3} + 0,75} \right):\left( {4\dfrac{3}{4} - 3\dfrac{1}{2}} \right)\\
= \left( {\dfrac{1}{4} + \dfrac{1}{3} + \dfrac{3}{4}} \right):\left( {\dfrac{{19}}{4} - \dfrac{7}{2}} \right)\\
= \left( {1 + \dfrac{1}{3}} \right):\dfrac{{19 - 14}}{4}\\
= \dfrac{4}{3}.\dfrac{4}{5}\\
= \dfrac{{16}}{{15}}
\end{array}$
