The exponent is 2/3 ?
The numerator of the exponent is an exponent, and the denominator of the exponent is the index of a root.
in a fraction exponent, the numerator is the power, the denominator is the root
you got that?
When you have a fraction as an exponent, replace the fraction with an exponent and a root. The numerator tells you the exponent. The denominator tells you the root. For example: |dw:1433802621349:dw|
In your problem, the base is 3. The exponent is 2/3. We use 2 as an exponent, and 3 as an index of a root. |dw:1433802723788:dw|