Exponents are operations. You know that removing a negative in the exponent means taking the reciprocal. Removing a whole number (like 4 = 4/1) in the exponent means repeated multiplication. This section adds another operation. The denominator in an exponent indicates a root.
You should also be able to find the roots above without your calculator. You should also be able to do them on your calculator using your exponent key [yx or ^]. Put parentheses around the exponent so that it all stays in the exponent.
When several operations are indicated in the exponent, do the root first. It's easier that way.
Remove 3 in the denominator,
All the exponent rules still work with fractional exponents. They are just messier.