How can I change the font size of a fraction in an index?

Question

I have, as part of an equation, the object

a^{5} \left(\frac{b}{c}\right)^{\frac{2}{3}}

The problem is that the 2 and 3 are very small (compared to the 5) and I would like all sub/superscripts to be the same size just as all body text is the same size. Is there a way of defining the font size inside the equation environment?

Answer 1

I've managed to solve it by replacing \frac by \tfrac.

Answer 2

Try dfrac instead of frac: a^{5} \left(\dfrac{b}{c}\right)^{\dfrac{2}{3}} You will need the amsmath package