1+ 1 easy to win. According to the relevant data of the May 4th junior high school math workbook, the May 4th junior high school math workbook 1+ 1 is light and won the championship. The characteristics of "1+ 1 lightweight winning optimization training" are: easy arrangement, solid foundation, prominent focus, clear steps, appropriate difficulty, urgent needs of students and thinking of teachers. It is a "royal teaching aid" or "standard teaching aid" that many teachers are willing to recommend to their students.