A. \({\left( {\frac{1}{3}} \right)^3}\)
B. \({\left( { - \frac{1}{3}} \right)^3}\)
C. \(\frac{1}{3}\)
D. \( - \frac{1}{3}\)
A
\(\begin{array}{l}{\left( {\frac{1}{3}} \right)^9}:{\left( {\frac{1}{9}} \right)^3} = {\left( {\frac{1}{3}} \right)^9}:{\left( {\frac{1}{3}} \right)^6}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\left( {\frac{1}{3}} \right)^{9 - 6}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\left( {\frac{1}{3}} \right)^3}\end{array}\)
Chọn A.
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