Giải đáp: $\begin{array}{l}{16^5}{.9^9} – {2^{19}}.3\\ = {\left( {{2^4}} \right)^5}.{\left( {{3^2}} \right)^9} – {2^{19}}.3\\ = {2^{20}}{.3^{18}} – {2^{19}}.3\\ = {2^{19}}.3.\left( {{2^1}{{.3}^{17}} – 1} \right)\\ = {2^{19}}.3.\left( {{{2.3}^{17}} – 1} \right)\end{array}$ Trả lời
{16^5}{.9^9} – {2^{19}}.3\\
= {\left( {{2^4}} \right)^5}.{\left( {{3^2}} \right)^9} – {2^{19}}.3\\
= {2^{20}}{.3^{18}} – {2^{19}}.3\\
= {2^{19}}.3.\left( {{2^1}{{.3}^{17}} – 1} \right)\\
= {2^{19}}.3.\left( {{{2.3}^{17}} – 1} \right)
\end{array}$