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I just found out. It on the Khan Academy help page: "Fractional exponents: use the ^ symbol and put the fraction in parentheses.  For example, to enter the cube root of x or x to the 1/3 power type...

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3. How to enter fractional exponents?

I have this same problem.  And using the division symbol on a laptop is a real nuisance.

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3. How to enter fractional exponents?