To convert the expression \( 216^{-\frac{1}{3}} \) into a form with a rational exponent, we can apply the properties of exponents.
The expression \( 216^{-\frac{1}{3}} \) means:
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The negative exponent indicates that we take the reciprocal of the base: \[ 216^{-\frac{1}{3}} = \frac{1}{216^{\frac{1}{3}}} \]
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The exponent of \( \frac{1}{3} \) indicates that we take the cube root of 216.
Thus, the expression \( 216^{-\frac{1}{3}} \) is equivalent to: \[ \frac{1}{\sqrt[3]{216}} \]
In terms of a rational exponent, it is represented as: \[ 216^{-\frac{1}{3}} \]
Therefore, the rational exponent for the expression \( 216^{-\frac{1}{3}} \) is \( -\frac{1}{3} \).