9\(^3\) . \(\dfrac{27^5}{81^3}\) . 3\(^{13}\)
=9\(^3\) . \(\dfrac{\left(3^3\right)^5}{\left(3^4\right)^3}\) . 3\(^{13}\)
=(3\(^2\))\(^3\) . \(\dfrac{3^{15}}{3^{12}}\) . 3\(^{13}\)
= 3\(^6\) . 3\(^3\) . 3\(^{13}\)
=3\(^{6+3+13}\)
=3\(^{22}\)
\(\dfrac{9^3\cdot27^5}{81^3\cdot3^{13}}=\dfrac{\left(3^2\right)^3\cdot\left(3^3\right)^5}{\left(3^4\right)^3\cdot3^{13}}=\dfrac{3^{2\cdot3}\cdot3^{3\cdot5}}{3^{4\cdot3}\cdot3^{13}}=\dfrac{3^6\cdot3^{15}}{3^{12}\cdot3^{13}}=\dfrac{3^{21}}{3^{25}}=\dfrac{1}{3^4}=\dfrac{1}{81}\)
\(\dfrac{9^3\cdot27^5}{81^3\cdot3^{13}}=\)
=\(\dfrac{3^6\cdot3^{15}}{3^{12}\cdot3^{13}}\)
=\(\dfrac{3^{21}}{3^{25}}\)
=\(\dfrac{1}{3^4}\)
=\(\dfrac{1}{81}\)
sai thì thôi nhoa
