Different versions: Li Lin's original textbooks are usually divided into "basic articles" and "improved articles", covering three parts: high number, line generation and probability. Beihang edition combines these two parts into one book.

Different applicable groups: If candidates are not particularly demanding on mathematics and just want to simply understand and master basic concepts and methods, then Beihang Edition may be a good choice. However, if candidates want to have a deeper understanding and mastery of mathematics knowledge and have confidence in their own mathematics level, then the original version may be more suitable.