Hello wackybit,
to get correct math terms you need an other app for creating it and than insert the result into Pages. In the folder "Application > Utitlities" there is the app "Grapher" with the abilities of good math equations creation. Just drag and drop the equation or whatever you need from Grapher into Pages. This is of course no solution if you need a lot of equations. But it is without buying another.
If you want to use only Pages in your workflow, than there is no solution to do that in a proper way.
I hope this helps a bit.