Tính :
a)  ${\left( {\frac{1}{3}} \right)^{{{\log }_{27}}81}}$
b)  ${10^{3 + 2{{\log }_{10}}3}}$
c)  ${4^{3{{\log }_8}3 + 2{{\log }_{10}}5}}$
d)  ${9^{\frac{1}{2}{{\log }_3}2 - 2{{\log }_{27}}3}}$
$\begin{array}{l}
a/{\left( {\frac{1}{3}} \right)^{{{\log }_{27}}81}} = {\left( {\frac{1}{3}} \right)^{{{\log }_{{3^3}}}{3^3}}} = {\left( {\frac{1}{3}} \right)^{\frac{4}{3}}} = \frac{1}{{3\sqrt[3]{3}}}\\
b/{10^{3 + 2{{\log }_{10}}3}} = {10^3}{.10^{{{\log }_{10}}9}} = {10^3}.9 = 9000\\
c/{4^{3{{\log }_8}3 + 2{{\log }_{16}}5}} = {2^{2.3{{\log }_{{2^3}}}3}}{.2^{2.2{{\log }_{{2^4}}}5}} = {2^{{{\log }_2}9}}{.2^{{{\log }_2}5}} = 9.5 = 45\\
d/{9^{\frac{1}{2}{{\log }_3}2 - 2{{\log }_{27}}3}} = {3^{{{\log }_3}2 - \frac{4}{3}{{\log }_3}3}} = \frac{2}{{{3^{4/3}}}} = \frac{2}{{3\sqrt[3]{3}}}
\end{array}$
phần A sai hay sao ý 81=3 mũ 4 mà –  phannho123 24-03-13 09:55 PM

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