Suggest the latter, in fact, Li Yongle changed a publishing house this year, and the original book continued to be published for some reason, but the content was the same as last year, only with a different cover. He and his book have been adapted, keeping the classic arrangement of line generations and improving the high number part (if you are interested, you can read a book called "Mathematics Standard Book for Postgraduate Entrance Examination", which is very powerful and has now been added to Li's new book). Personally recommend Li and Wang's books ~