How do you express 1/39 as an expression using a negative exponent other than -1? (i.e. Not 39^-1)
The only way I can see this is to create an equivalent fraction and write with negative exponent. That is.
#"or " 1/39=1/(3xx13)=1/3xx13^-1#
If this is not what is required you can get back to me.