You may want to review fractional exponents first.

You can raise a number to a fractional exponent too. It's a good
idea to do the problem in 2 steps. For example, suppose you have
to compute 2048^{2 / 11}. You should first compute the
11^{th} root of 2048, which is 2. Then you should square
the 2, getting 4, the answer.

Of course, if the fraction has numerator 1, you won't need to do
the second step. (And, if it has *denominator* 1, then it's
not really a fraction at all!)

As always, the exponent could be 0, or a negative number. This
means the same thing as always; so 125^{−1 / 3} = 1
/ 125^{1 / 3} = 1 ⁄ 5.