/sci/ - Science & Math

I'm doing Spivak's Calculus and I'm already struggling a bit in the first 3 exercises of chapter 1, I've never been asked to prove things like this, with a complete focus on algebraic properties. While I do want to learn this a lot, it's starting to get frustrating and I'm asking myself if I'm simply not ready for this or if I should do whatever I can, check the solutions when necessary(they're not available for all questions anyway) and go on, only worrying about really doing 100% of it on a future occasion. What do you think?