Giải thích các bước giải:
\(\begin{array}{l}
7/\frac{{{5^{11}}{{.7}^{11}}.\left( {7 + 1} \right)}}{{{5^{11}}{{.7}^{11}}.\left( {5 + 9} \right)}} = \frac{8}{{14}} = \frac{4}{7}\\
8/\frac{{4\left( {5 + 11} \right)}}{{4\left( {4.7 - 3} \right)}} = \frac{{16}}{{25}}\\
9/\frac{{5\left( { - 3.8 + 2.7} \right)}}{{5\left( {6 + 4.3} \right)}} = \frac{{ - 24 + 14}}{{6 + 12}}\\
= \frac{{ - 10}}{{18}} = \frac{{ - 5}}{9}\\
10/\frac{{{2^3}.5.7\left( {2.5} \right)}}{{{2^3}.5.7\left( {7.11} \right)}} = \frac{{10}}{{77}}
\end{array}\)
