think I haven't a clear purpose, because I think "I want to structure this content in my head, so, I'll have the formulas and I'll can relate it"
Nope that's not what I would call a purpose.
Why do you want to have the formulas? How will you be using them. In what settings. Identify those reasons you'll have a purpose, build your curiosity and a way of knowing when you've done enough activation. You'll know that you can use the formulas as intended.
Also see the PhotoReading book 4th edition page 24.
Alex
