Đáp án:
\[\frac{1}{2}\]
Giải thích các bước giải:
\[\frac{{{2^{12}}{{.3}^5} - {4^6}{{.3}^6}}}{{{2^{12}}{{.9}^3} + {8^4}{{.3}^5}}} = \frac{{{2^{12}}{{.3}^5} - {2^{12}}{{.3}^6}}}{{{2^{12}}{{.3}^6} + {2^{12}}{{.3}^5}}} = \frac{{{2^{12}}{{.3}^5}.\left( {1 - 3} \right)}}{{{2^{12}}{{.3}^5}\left( {3 + 1} \right)}} = \frac{2}{4} = \frac{1}{2}\]
