contestada

Hi! I have a couple of questions...

How do I simplify these...?


1. (2x - 3xy)(x - 3y) - (x - 2xy) =

2. (3t^2)^3/t =

3. x^7y^-2z^4/x^-3y^2z^3 =

4. x+1/x2 • x/x2-1 =

5. 2x+4/2 + x/x2 =