In fact, the formula in the book is very detailed. If you understand it yourself, you can deduce it yourself, which is better than reading books on the market yourself.

I also recommend one: PASS green card? Zhang: Analysis of the Law and Key Points of Mathematical Formulas in Senior High School (PEP Edition B) (Compulsory+Elective) (9th Edition) (20 13 Edition) (with Efficient Learning Card) [Paperback] "

Hope to adopt.