Maths Help

[Mandizzle]

Right, I'm doing my Maths Sixth Form bridging work and I can't remember how to do:

Express 1/a - 1/b as a single fraction.
AND
Rearrange the formula 1/f - 1/u + 1/v to make 'u' the subject.

Anybody help?

[Woocky]

Re: Maths Help

Probably could help you if the terms were in Dutch though...