Đáp án:
$\begin{array}{l}
G = \dfrac{{{{5.4}^{15}}{{.9}^9} - {{4.3}^{20}}{{.8}^9}}}{{{{5.2}^9}{{.6}^{19}} - {{7.2}^{29}}{{.27}^6}}}\\
= \dfrac{{{{5.2}^{30}}{{.3}^{18}} - {2^2}{{.3}^{20}}{{.2}^{27}}}}{{{{5.2}^9}{{.2}^{19}}{{.3}^{19}} - {{7.2}^{29}}{{.3}^{18}}}}\\
= \dfrac{{{2^{29}}{{.3}^{18}}\left( {5.2 - {3^2}} \right)}}{{{2^{28}}{{.3}^{18}}.\left( {5.3 - 7.2} \right)}}\\
= \dfrac{{2.\left( {10 - 9} \right)}}{{15 - 14}}\\
= 2
\end{array}$
